I. Function Overview
1. Wall-mounted installation, aluminum alloy die-cast shell, wall thickness not less than 5MM, strong anti-vandalism.
2. Industrial three-proof design, waterproof and dustproof rating meets GB/T 4208-2017 IP68.
3. Supports telephone line signal access, twisted pair interface.
4. Supports off-hook auto-dial setting.
5. Supports automatic answering of incoming calls and broadcast activation, allowing simultaneous hands-free communication without opening the cover.
6. Supports power supply via telephone line feed, no external power required.
7. Supports busy tone detection and call termination.
8. Supports customized audio output interface for external active speakers.

II. Operation Instructions
1. Off-hook/On-hook method: Handset-controlled off-hook/on-hook; off-hook for connection, on-hook for disconnection.
2. Answering calls: When there is an incoming call, the phone rings; pick up the handset to communicate, and hang up after the call ends.
3. Making calls: Pick up the handset to automatically dial the preset number; communicate after the other party responds.

III. Main Technical Parameters
1. Supports connection to telephone PBX and PSTN lines with feed voltage of 24V-60V.
2. Temperature: -40℃~75℃ Relative humidity: 10%~95% Atmospheric pressure: 86~106 Kpa Ambient noise: ≤100dB(A) 
3. Ringing sound level: ≥90Db 


IV. Packaging Dimensions
Unit dimensions: 355*260*130 (mm)
Master carton dimensions: 439*277*191 (mm)
Packaging materials: EPE foam, carton
Gross weight: 9KG
Net weight: 7.2KG