Device features a real-time location can always locate personnel matter where speed is the number which direction to move the move. Equipment positioning accuracy, the error is within 30m. 2 real-time voice intercom can always dispatch your staff, you can talk to many. Clear sound, voice, fast delivery, low delay, displays the name of the caller. 3 can receive calls and receive calls, intercom mode and mobile phone mode can be converted at any time, phone mode takes precedence. 4 texting can send and receive SMS, support Chinese and English input. 5 receiving network information within the network can receive the information that the server center can simultaneously send a text message to all staff. 6 Caller ID device LCD screen can display the name of the party to speak. Middle left side of the 7 Volume 5 regulating device has two volume control buttons to adjust the size of the volume. 8 headset features professional custom intercom headset. Electrical characteristics of the communication network: based on CDMA or GPRS (indicators meet the national standard) Standby time: 200 hours of voice compression rate: 2400kbps equipment Operating temperature: -20 ~ 70 ° C Relative humidity: ≤90% (non-condensing) seismic equipment levels:级 3 GPS positioning accuracy: less than 30m module sensitivity: up to -159dBm start time: Hot start: 1 second; Warm start: 32 seconds; Cold start: 34 seconds module receives satellite channel frequency 1575.42MHz precision 12-channel speed 0.1m / s Location Upload interval:> 1s