A screen inside the house works when the phone is upstairs on charge · review
Two touch monitors for a hundred and fifty-six dollars, on a listing that admits its own release output will not drive most locks.
The conclusion Two 7-inch touch monitors and a camera for a hundred and fifty-six dollars, with the rain cover and terminals in the box — the cheapest two-screen system on this shelf by a wide margin. It also does something most of this shelf does not: it tells you its release output will not drive a strike, a bolt or a magnetic lock without a separate controller. Four conductors are required, there is no recording, and the screen resolution is not published.
No screen resolution. No recording. No contact rating.
Which at least five of the thirteen listings here do not.
The monitor’s release output is a signal, not a supply. A strike, a bolt or a magnetic lock needs a controller board and a transformer between the two.
That is an extra box in the hallway and an extra cost, and AMOCAM says so on the page.
This shelf’s introduction asks whether the monitor can drive a strike, and on which contact. The honest answer here is: not directly, and the contact is not rated.
Which decides the whole job.
This shelf’s buying tip: an existing two-core cable is an afternoon, four cores through a buried duct is a different project.
Older bell cable is almost always two cores.
The two-wire systems on this shelf start at two hundred and ten dollars. This is a hundred and fifty-six with two monitors. If your cable is already four-core, that gap is money saved.
Because it burns out, and the camera is the part that looks like it needs power.
On a four-wire system the transformer feeds the indoor monitor, and the monitor supplies the camera down the same cable.
Plugging the adapter into the camera puts full supply voltage where a regulated feed belongs.
AMOCAM adds two more: test with its own cable first, and keep the units apart while testing or they howl.
Three warnings, all earned.
Which is the cheapest two-screen system here.
The same system with one button-operated monitor is eighty-two dollars, and it publishes 800 × 480.
This one is touch, and publishes no pixel count at all.
On sale at around $156 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Monitors | Two 7-inch color LCD touch screens with one outdoor camera, stated in the description. Touch rather than the button operation on the single-monitor version of this same system |
|---|---|
| Wiring | A four-wire setup, surface mounted, with a rain cover, connection terminals and screws supplied — stated. This shelf's introduction warns that a four-wire system usually cannot reuse an existing bell cable, so count the conductors to the gate before ordering |
| Access control | Electric lock control from the monitor — and the listing states the limit plainly: an electric bolt lock, electric strike or electromagnetic lock needs an extra power supply controller between the intercom and the lock. It is one of only two listings on this shelf to admit this, and no contact rating is given |
| Outdoor unit | A 92-degree camera behind an aluminum and acrylic front panel, stated against vandalism, with weatherproofing and infrared night vision. Ninety-two degrees is the narrowest field of view published on this shelf |
| Resolution | Not published. The single-monitor version of this same system states 800 × 480; this listing states a touch screen and no pixel count |
| Audio | Hands-free intercom, two-way, stated |
| Monitor | Sixteen selectable chimes, adjustable volume, brightness and contrast, dimmable display, auto turn off — stated |
| Installation | AMOCAM states three cautions: test with the original cable before installing, keep the units apart while testing or they howl, and never connect the power adapter to the outdoor unit — the adapter goes to the indoor monitor or the outdoor unit burns out |
| Recording | None. No card slot, no memory and no capture |
| Amazon reference | B071NF53VC |
| EAN | 0647726600352 |
That the monitor's release output is a signal, not a supply, and that a strike, bolt or magnetic lock needs a controller board and a transformer between the two. AMOCAM says so outright, which is more than at least five of the thirteen listings on this shelf manage, and it is a real cost and a real extra box in the hallway. This shelf's introduction asks whether the monitor can drive an electric strike and on which contact; here the honest answer is that it cannot do it directly, and no contact rating is published to plan the controller around.
Four, stated, and that is the decision to make before anything else. This shelf's buying tip is explicit: replacing an intercom on an existing two-core cable is an afternoon, and discovering you need four cores through a buried duct is a different project entirely. An older bell cable is almost always two cores. The two-wire systems on this shelf start at two hundred and ten dollars; this is a hundred and fifty-six with two monitors. If the cable is already four-core — many intercom installations are — that difference is simply money saved.
Because AMOCAM says it will burn out, and the warning is worth repeating because the outdoor unit is the part that looks like it needs power. On a four-wire system the transformer feeds the indoor monitor, which then supplies the camera down the same cable. Plugging the adapter into the camera puts full supply voltage where a regulated feed should be. AMOCAM also says to test the kit with its own cable first and to keep the units apart while testing, or the speaker and microphone howl at each other. Three warnings, all of them earned.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Wiring | Access control | Recording |
|---|---|---|---|---|
| AMOCAM 70H-M42 wired video door phone system, 7-inch touch screen, two monitors | $156 | A four-wire setup, surface mounted, with a rain cover, connection terminals and screws supplied — stated. This shelf's introduction warns that a four-wire system usually cannot reuse an existing bell cable, so count the conductors to the gate before ordering | Electric lock control from the monitor — and the listing states the limit plainly: an electric bolt lock, electric strike or electromagnetic lock needs an extra power supply controller between the intercom and the lock. It is one of only two listings on this shelf to admit this, and no contact rating is given | None. No card slot, no memory and no capture |
| Aiphone LEM-1DLS Access Sentry audio intercom set, 1 door, 1 master station | $150 | Two-conductor with an overall shield, from the door station to the answering station, with Aiphone #822202 (22AWG) or #821802 (18AWG) named by part number. It is the only listing on this shelf to name a cable, and the shield matters: an unshielded run alongside mains cable hums | A normally-open dry contact rated 30 V AC/DC at 1 A — stated. This shelf's introduction makes gate release its second decisive specification and asks specifically on which contact; this is the only listing on this shelf that answers. A dry contact means the intercom closes a circuit and supplies no power, so the strike needs its own supply within that rating | None. No card, no memory and no capture |
| LUMOBELL 2W_KW02_IP7 two-wire video intercom with dual 7-inch touch screens | $210 | Two-wire, stated to use existing lines. This shelf's introduction calls this the installation detail that decides the job: a two-wire system reuses an existing bell cable and a four-wire one usually does not. Three listings on this shelf need four conductors | Door release from the monitors, the Tuya app or RFID tags — stated. No contact type, voltage or current rating appears, which this shelf's introduction asks for specifically | Snapshots or video to an included SD card, with no monthly fee and no cloud — stated. The card capacity is not given. It is one of two listings on this shelf that record to card at all |
| AMOCAM 70H-M4 wired video intercom kit, 7-inch 800 × 480 monitor | $82 | A four-wire setup, surface mounted, with a rain cover, connection terminals, screws and materials supplied — stated. This shelf's introduction warns that a four-wire system usually cannot reuse an existing bell cable | Electric lock control from the monitor, with the limit stated: only an electronic lock opens directly from the indoor monitor, and a strike lock, bolt lock or magnetic lock needs a power supply control to work with the system. No contact rating is published | None. No card slot, no memory and no capture |
Details checked on October 8, 2026.
A two-floor house with four conductors already run, where a touch screen beats a row of buttons
Specifications: the manufacturer sheet for home security products and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Flush-mounted outdoor unit · 150° Full HD · 7-inch monitor · app · IP54 and IK07 · tamper alarm
A complete single-family set with a flush-mounted outdoor station, a 150° Full HD camera, a 7-inch monitor and app access. Balter states IP54 and IK07 ratings and a tamper alarm on the outdoor unit.
Best for: A new or renovated entrance where a recess can be cut and the outdoor unit should sit flush in the wall.
Surface-mounted outdoor unit · 150° Full HD · two 7-inch monitors · app · IP54 and IK07
The surface-mounted version of the ENTRI set, supplied with two 7-inch monitors. Same 150° Full HD camera, same IP54 and IK07 ratings, same tamper alarm — and no recess to cut.
Best for: An existing house with two floors, where cutting into the wall is not on the table.
7-inch master station · die-cast aluminum vandal-resistant door station · 24 V DC · 165 ft on 22AWG, 330 ft on 18AWG — the only cable run length on this shelf · 30 stored still images · expandable to 1×2 only · the page lists JV-series parts in its bullets and JO-series parts in its description
The only listing here that tells you how far the cable can run — on a page that names two different product families for the same box.
Best for: A long cable run to a gate, where the distance figure and die-cast construction justify seven hundred dollars
≈ $700
