saful TS-WP708 1V2 7inch Wireless Video Door Phone Saful wireless video door phone TS-WP708 is widely used in apartment, hotel, villas, office, ... longer working life; 6.High Sensitivity touch keys 7.Monitor, wireless unlock, hands-free call and talk; 8.16 chord melodies ... ) Using battery, it can works about 15 days. 14.With Wireless unlock control ,Tamper alarm function; 15.One outdoor camera supports ...