La description

Features: 1. Based on GSM **0/**0/***0/***0MHz 2. Support reverse polarity 3. Can connect to PBX. 4. With PSTN port Main Functions: 1. Using GSM SIM card 2. Making & answering calls after connecting to telephone set 3. Available to connect with telephone set, Billing machine, etc 4. Supports the functions of redialing and hands-free 5. Voice adjustment of calling in and out, multi-lever volume to be chosen 6. Caller ID 7. Can dial-out by choice through PSTN or GSM 7. Featured with signal intensity indicator, working status indicator, breakdown indicator, etc 8. Built-in PIN code protection featured with locking device/card/network Technique Parameters:  Working Frequency  Power Consumption: <=5W  Working Voltage: DC*2V  User Access Port: Dialing tone frequency: **0Hz continued Busy tone frequency: **0Hz 0.*5s/0.*5s Package Information: Size: **1(L) x **5(W) x *5 (H)mm Weight: **0g Package: 1pcs/box; *0boxes/carton Carton size: *8.5**9.5**7.5CM G.W/CTN: *5kgs Connect person: david Email:*****