Product description: Can be used with ordinary telephone conds Stop confirmed sound: 450 hz to 0.7 seconds Insider ringing: 1 seconds, stop for 4 seconds Exterior line incoming call is ringing, vibration, 0.7 seconds to 2.5 seconds for 0.7 seconds 0.7 seconds of vibration pause Power supply: AC220V plus or minus 10%, 50 hz Power consumption: < 15 w Size: 310 mm x 310 mm x 45 mm The main function 1. the whole cord non-blocking exchange. 2.call display function (FSK and DTMF double system compatible). 3. automatic IP phone exhaled, cost savings. 4.exterior line incoming call can direct extension, can be recorded since the 2 section of the voice prompt. 5.breathe more level restrictions; Breathe out time limit; Dial the code limit limits; Password restrictions; Charter code restrictions. 6.can set a variety of flexible service function; Exhale hotline; Don't disturb busy callback; Displacement transfer; Busy a Size: 310 mm x 310 mm x 45 mm