... voice door phone (1V3) 1.1V3 2.2.4G ISM Public Frequency Band:2402MHz-2479MHz Professional intercom wireless voice door phone (1V3 ... (1V3)Wireless voice intercom doorbell worked in 2.4G ISM band,with wireless call,wireless remote unlock,LED flash when ... office and inconvenient occasions of wiringFunctions:1.2.4G ISM Public Frequency Band:2402MHz-2479MHz2.Transfer rate:250K,receiver sensitivity: less ...