Features:
1. Industrial GSM module(support 900MHz/1800MHz or 850MHz/1900MHz)
2. Menu in English, Chinese and Spanish
3. Voice volume adjustable
4. Network management function
5. Internal LI-NI backup battery
6. Support English, Chinese and Spanish SMS
7. Display of dialing calls, incoming calls and missed calls
8. Preset local handset numbers and block numbers
9. Locking network, SIM card, and machine and card together
10. Preset local prefix and IP access number
11. High quality of talking voice
12. Battery talking time:2-3 hours, battery standby time: above 48 hours

Specifications:
1. Frequency: 900MHz/1800MHz or 850MHz/1900MHz
2. Power supply: 110~240V AC, 6V DC 50/60Hz
3. Temperatures: 0℃~+50℃
4. Humidity: 10%~95%
5. Pressures: 86~106KPa