TS-999A2 Wireless Digital Video Door Phone Doorbell with 2.5 inch Display Screen & Antenna, Suppo...

1. Radio frequency signal connection, do not need WiFi and wiring.
2. Visual intercom, you can talk with them by inside unit when the guest push the bell.
3. One-button unlock, long distance control the lock by short press the unlock button.
4. Monitoring functions, real-time view the outdoor scene by indoor unit.
5. Indoor group call, the call can be made in both direction when there are with the indoor unit more than one unit.
6. The device will take photo after ring 5 seconds, will save a photo of the guest if no one answer after 40 seconds.
7. Automatically senses light changes, with night vision infrared light, and is clearly visible at night.
8. Indoor monitor transmission power 18-20dBm, receive sensitivity indoor monitor -100dBm.
9. Outdoor camera transmission power 18-20dBm, receive sensitivity outdoor camera -100dBm.
10. Transmission distance: audio about 500m in the open, video and audio about 300m in the open.