H8-2T 1000m Long Range 38 Ringtones 2 Way Wireless Intercom Doorbell for Home/Hospital/Hotel - White+Silver ?Indoor Intercom: The intercom machine can be used as intercomunicador for two way talk ?Dual Channels: Dual channels A and B support adjusting the corresponding call channel. Press to talk ?Long Battery Life: The 2 way voice intercom has built in 1800mAh large capacity battery,adopts intelligent power saving chip,with long battery life ?Long Range: The transmission distance of the voice intercom device can achieve 1000m in open area and 20 to 50m through wall,highly practical ?Wide Application: This clear sound quality intercom system is suitable for use in different application scenarios,such as hospitals,hotels,factories,teahouses,etc. ?Power key: 0 gear--off,A gear--A frequency,B gear- -B frequency. If interference occurs during a call,switch the outdoor unit and indoor unit to A or B at the same time ?Specifications: ?Battery: 1800mAh,3.7V polymer lithium battery ?Power supply: DC5V/1A ?Working temperature: -20??55?? ?Transmission distance: about 1000 meters in the open,20-100 meters through wall ?Working frequency: B frequency: 462MHz,A frequency: 434MHz ?Working time: about 1 week after full charge ?Charging time: about 5 hours to fully charge ?Music ringtones: 38 ringtones ?Ringtone volume: 3 levels of adjustment (adjust the volume button when in standby mode) ?Call volume: 3 levels of call volume adjustment (adjust the volume button when the call is working) ?Product size: 116*56*18mm ?Charging stand size: 70*56*29mm Package included: ?2 x Intercom Doorbell ?2 x Charger Base ?2 x Charging Cable ?1 x English User Manual