Details：
Handset mode, ordinary phone usage; RJ11 interface, built-in power adapter, AC220V power supply; when the called party rings, the loudspeaker will ring; support 3 sets of speed dial keys, one-key dialing can be realized after lifting the handset; compatible with various numbers Or analog program-controlled switchboard, and IAD gateway equipment; support automatic detection of busy tone, automatic hang-up, and automatic answering of called ringing; support external explosion-proof speakers and explosion-proof warning lights

Details：
Handset mode, ordinary phone usage; RJ11 interface, built-in power adapter, AC220V power supply; support 3 sets of speed dial keys, one-key dialing can be realized after lifting the handset; compatible with various digital or analog program-controlled switches and IAD gateway devices; support detection Busy tone automatically hangs up, and the called party rings automatically answering the function; supports external explosion-proof speakers and explosion-proof warning lights