... tamper alarmGross Weight :1.56KGPacking Size :335*257*70mmIntroductionSaful wireless video door phone TS-WP708 is widely used in apartment, hotel, villas ... , longer working life;6.High Sensitivity touch keys7.Monitor, wireless unlock, hands-free call and talk;8.16 chord melodies ... ) Plugging in the power adaptor. 2) Using battery, it can works about 15 days. 14.With Wireless unlock control ,Tamper alarm ...