Non-visual Audio Doorphone Intercom Doorbell Security System Support battery AC power

Specifications: 
* Model Number: TL-109AC/DC 
* Voltage: DC6V(8x AA battery)(4 in each handset) 
* Output sensitivity: <60mV（frequency 1000Hz） 
* Frequency response: ±3dB(300Hz-3400Hz) 
* Noise voltage: <10mV 
* Ring sound level: >70dB(AT 0.5m) 
* Quiescent current: <5uA 
* Intercom working current: <100mA 
* Color: white 
* Talk time: unlimited, free calls 
* Power Source: Battery 
* Range of application:Family,School,Restaurant,Office and so on 
* Excellent consumer side of the tone circuit, intercom voice clarity 

Installation and use 

1 Set a double wire line screwed onto the back of the bases to connect each set together(wire line is not included),Within 30m use distance,you can use multicore cable to connect each set,in right ways,1-1,2-2,in each back of the phones,30-80m use distance,you can use copper wire to connect. 
2 Insert 8 cells 1.5V AA batteries (4 in each handset)(alkaline) ,into the cabinet of the talkback pair 
3 Press the call button to listen after the ringing , lift the handset microphone and you wait for the other to pick up the call 
4 While talking, please speak into the microphone 

Package includes: 
2 x Anpress Intercoms Doorbell