1. This public hotline telephone makes up of a handset, hook, mainboard, and microphone in a cold-rolled steel body.
2. When the handset is picked up, the telephone will dial the hotline number automatically.
3. The hotline number can reset if necessary.
4. Waterproof grade is IP55.
5. Vandal resistant handset with armored cord, crystal tone quality, magnetic hook.
6. Lightning protection to ITU-T recommendation K21.
7. Mainboard compatible with an electret microphone and dynamic microphone.
