GSM (3G/4G optional) Elevator Intercom K1S is a Brevity,Fashion,Neat design Elevator Emergency call unit, it is special for emergency call out for help or voice communication. It is suitable for different elevators,closed public area emergency call. Inbuilt microphone and speaker for two way talk. White List function enable K1S to block unknowing numbers. Simple setting by SMS commands or Smart Phone APP. Li-ion rechargeable back up battery to ensure K1S works even AC power lost. King Pigeon Communication Co.,Ltd is a professional GSM 3G Alarm,Wifi Gsm Alarm,Wifi 3G Alarm,Wifi Gsm Camera Alarm, Gsm/3G/4G Access Control, Gsm/3G/4G Apartment Intercom, Gsm/3G/4G Elevator Intercom,GSM SMS Controller Alarm, GSM GPRS 3G M2M, GSM GPRS 3G RTU Automation, GSM GPRS 3G Telemetry Data Logger, GSM 3G Senior Telecare, GSM 3G Senior Telehealth OEM ODM Manufacturer since 2005. For more information please feel free to contact us: