Best price stainless steel key keypad phone which need monitoring

Product Name: Jail telephone
Product Type: JWAT**7 
Communication system: Switchboard
Defend Grade: IP*4
Dimensions: **7.5 × **5 × *5
Material: Stainless steel **4
Color: stainless steel qualities
Electronic sample:

Suitable for inside prisons, labor camps, drug rehabilitation and other intercom, communication and other places which need monitoring.

1. The phone can form an independent telephone communication system with program-controlled switches and couplers. 2. The phone can be connected directly to the telecommunications network.
3. After the composition of the call system, each phone is an independent station. The malfunction of any phone doesn't affect the whole system work.
4. After the composition of the call system, the product has an automatic gain function, and the voice does not vary with distance or telephone quantity.
5.Telephone circuits within the integrated circuit using internationally accepted double-sided, with hair the exact number, call clarity, job stability, etc.
6. Stainless steel housing, high mechanical strength, strong impact.
7. Key parts of the handset and the hooks are both produced by our own company; Quality control strictly; After-sale reaction fast.
8.Volume can be adjusted.
9. There's an area to place an instruction card in front of the telephone.

1. The caller takes off-hook, dial the callee's telephone number → the callee's telephone rings.
2. The callee hears ringing → pick up the handset to answer the call, both sides under normal conversation.
3. Press "VOLUME" to adjust the volume during the call.
4. At the end of the call, hang back the handset.