... the gate, at a glance. Safe and secure.3. picture archive features: Masters at home, a ... owner returns free queries, Miss any important meeting.4. video intercom functions: customer visit, according to Bell ... press, visible,press again, automatically unlock This system can be used in apartments,villas,hotels,offices ... C/5°F~131°F 2.4 inch Wireless video doorphone doorbell Intercom System 1 V more more V 1