LB-FL call device, With highly water-proof performance,easy to use widely used in office,apartment/nursing home intercom Features: LB-FL call device 1. Connect the master and substation by non-polarity wire.2. Waterproof switch, the waterproof performance is high3. Easy to use 4. widely used in office,apartment/nursing home intercom for emmergency need. Technical Parameter Work environment term:- ...