Details：
Hands-free mode, ordinary phone use; RJ11 interface, built-in power adapter, AC220V power supply; when the called party rings, the loudspeaker will ring; support sound and light alarm, called state warning lights flashing, alarm ring work; support 4 groups Speed dial button, one-key dialing can be realized after hands-free; compatible with various digital or analog program-controlled switches, and IAD gateway equipment; support automatic detection of busy tone and automatic answering of the called ring
Details：
Hands-free mode, ordinary phone use; RJ11 interface, built-in power adapter, AC220V power supply; support sound and light alarm, called state warning light flashes, alarm ring work; support 4 groups of speed dial keys, one-key dialing can be realized after hands-free ; Compatible with a variety of digital or analog program-controlled switches and IAD gateway devices; support automatic detection of busy tone and automatic answering of the called ring; support external explosion-proof speakers and explosion-proof warning lights
Details：
Hands-free mode, ordinary phone usage; RJ11 interface, built-in power adapter, AC220V power supply; when the called party rings, the loudspeaker will ring; support 4 sets of speed dial keys, hands-free can realize one-key dialing; compatible with various Digital or analog program-controlled switches, 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：
Hands-free mode, ordinary telephone use; RJ11 interface, built-in power adapter, AC220V power supply; support 4 sets of speed dial keys, one-key dialing can be realized after hands-free; compatible with various digital or analog program-controlled switches, and IAD gateway devices; support Detects busy tone and automatically hangs up, and the called party rings and automatically answers; supports external explosion-proof speakers and explosion-proof warning lights
Details：
Handset mode, ordinary telephone usage; RJ11 interface, built-in power adapter, AC220V power supply; when the called party is ringing, the loudspeaker will ring; support sound and light alarm, called state warning lights flashing, alarm ring work; support 3 groups of speeds Dial the key, you can realize one-key dialing after lifting the handset; compatible with various digital or analog program-controlled switches, and IAD gateway equipment; support automatic detection of busy tone and automatic answering of the called ring
Details：
Handset mode, ordinary phone use; RJ11 interface, built-in power adapter, AC220V power supply; support sound and light alarm, called state warning light flashes, alarm ring work; support 3 groups of speed dial keys, can realize one-key dialing after lifting the handset; Compatible with various digital or analog program-controlled switches, and IAD gateway devices; 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
