The Latch M2 is a Bluetooth-enabled mortise lock with a lever handle, designed for residential apartment unit doors and light commercial entries. It replaces an existing mortise lockset and gives residents keyless access via the DOOR app, a numeric doorcode entered on the Latch Lens, or a Latch Keycard. The "M" refers to the mortise form factor — the device works only on doors prepared for a mortise pocket.
The Latch M2 is a fully offline device. It does not connect to WiFi. All credential updates and firmware upgrades are delivered via Door Sync through the DOOR app.
Unlike the Latch C2, the M2 includes a physical key cylinder — a standard mechanical key can be used to operate the lock at any time, independent of the app or batteries.
Access methods
- DOOR app: unlock via Bluetooth while within range of the device
- Doorcode: numeric code entered on the Latch Lens (the exterior keypad)
- Latch Keycard: NFC tap against the Lens
- Mechanical key: the Latch M2 includes a key cylinder — a standard physical key can be used to lock or unlock the deadbolt at any time, independent of the app or batteries
How locking and unlocking work
From outside: The exterior lever is locked at all times — it cannot be turned without a valid credential. Present a credential (app, doorcode, or Keycard) → the lever hub engages for approximately 10 seconds → turn the lever to retract the latchbolt and pull the door open. The hub disengages automatically when the window closes. If the deadbolt is thrown, presenting the credential retracts both the latchbolt and the deadbolt as part of the same action.
From inside: The interior lever and thumbturn are always free. Turn the lever to retract the latchbolt; turn the thumbturn to throw or retract the deadbolt manually.
With the mechanical key: Insert the key into the exterior cylinder. Rotate one direction to retract the latchbolt; rotate the other to throw or retract the deadbolt. The mechanical key works regardless of battery state.
Connectivity
The Latch M2 uses Bluetooth (BLE 5.0) for app-based credential verification and NFC (13.56 MHz MIFARE DESFire Light) for Keycard reads. It does not connect to WiFi or any network. Credential updates and firmware reach the device via Door Sync through the DOOR app while in Bluetooth range.
What DOOR OS shows
DOOR OS displays whether the Latch M2 is activated and its last reported battery level. There is no real-time online/offline status — the device operates independently of any network connection.
Power
The Latch M2 runs on 6 AA non-rechargeable alkaline batteries housed in the interior battery tray. The electronics (Bluetooth, NFC, Lens) consume the battery — the latchbolt and deadbolt themselves require no power to move. Battery level is reported to DOOR OS via passive monitoring and active notifications. Replace batteries before they are fully depleted.
If the batteries are fully depleted, the mechanical key is the only path to regain entry. The Latch M2 does not support inductive (Qi) jumpstart — replace the batteries to restore electronic access.
Door compatibility
- Door thickness: 1-3/4" (44.5mm) — single thickness, not field configurable
- Backset: 2-3/4" (69.9mm)
- Door preparation: mortise pocket meeting the included template
- Deadbolt throw: 1" (25.4mm)
- Faceplate: 8" x 1/4" (203.2 x 6.4 mm), 0.06" thick
- Strike plate: ANSI 4-7/8" x 1-1/4" (123.8 x 31.75 mm) curved lip strike
- Handing: field reversible — the same M2 device can be installed on left-hand or right-hand doors
What Latch M2 is not
- Not a deadbolt-only lock — for residential deadbolt doors, see Latch C1 or Latch C2
- Not motorized for the latchbolt — the user must physically turn the lever or use the mechanical key
- Does not connect to WiFi or any network
- Does not include video or intercom capability — for visitor management, pair a DOOR Link or Latch Intercom at the building entry