Condition: 100% brand new Item Type: Wireless intercom Material: ABS plastic Color: As pictures shown Machine Classification: Host extension Digital Screen Display: Caller ID function Host Interconnection: Up to 100 units by pressing the ID key to call each other Host + Multiple Extensions: Up to 100 interconnected extensions can call the host with one key. The host can call the extension by pressing the ID button. Communication Distance(in Open Area): Approx.1000m/3280.8ft Power Adapter: Input: AC100V~240V Output USB Interface: DC5V/2A DC Installation Method: Free installation on the desktop Code ID Setting Function Ringtones Change Adjustment, Volume Adjustment Buttons: 10 digital buttons, 1 call button, 1 setting button Working Current: 400mA Standby Current: 70mA Transmitting Power: <18dbm Receiving Sensitivity: >-100dbm Working Frequency: 433MHz Applicable Situation: Company, factory, hotel, office, tea house, KTV, hospital, entertainment venue, etc. 1、Full?duplex wireless voice intercom, no wiring required. The extension of the main unit can display its own number and caller ID. 2、The working frequency is 433MHz, and the intercom system can support up to 100 intercommunication without stringing codes. Can realize the networking function, greatly improve your office efficiency. 3、The highest wireless intercom is up to 1000m/3280.8ft, so you are not restricted by a room. 4、The highest built?in battery can reach 60 days of talk time without charging, more practical. 5、One?key calling function, one?key calling host function, one?key broadcasting function, no need to wait for the call. The sound ringtone can be adjusted to allow you to customize the call ringtone and volume. 6、Suitable for company, factory, hotel, office, tea house, KTV, hospital, entertainment venue, etc. 1 x Intercom Phone Host 1 x Intercom Extension 2 x Power Adapter 2 x USB Cable