... ,Transfer rate:250K wireless voice door phone for long distance 500m 1V31,2.4G ISM Public Frequency Band:2402MHz ... Standby current: 6.5mA;Operating current: 70mA.8,Communication distance: 500 meters for barrier free Details:Wireless intercom doorbell is ... 2.4G Communications Channel, full-duplex interoperability intercom, communication distance up to 500 meters aboveInstructions:1,Boot:Connect the power ...