GPS tracker is a multi-use device.With special design collar it is for the Pet or Livestock which often go outside. The collar length is adjustable for median and large size pet such as dog and cat. Take off the collar and put into warterproof carry case,it also can be used on personal,vehicle,fleet or moving asset. There is also a SOS key on the T30A1 for emergency alarm. When you are jogging or hiking with your pet together, in case of encounter any accident, press this button to send out message for exactly location and fast help. Features 1. GPS SIRF-Star III chipset fast fixing the position even at a weak signal status. 2. Works worldwide! Support 3-frequency GSM 900/1800/1900 MHZ. 3. Receive phone calls and SMS and GPRS in three way communications. 4. Monitors can track the device without interfering him, LIVE! Real-Time tracking! 5. SOS button send out exact location for immediate rescue/action. 6. Independent SOS button which will send GPS information via SMS for 1 to 5 preset numbers. 7. System setting by SMS. FREELY! 8. Low battery notification before the battery runs out! Worrying free on why the locator wouldn’t respond for this kind of situation! 9. Speed limit alarm 10. Multi-user management on website. (GPRS mode) 11. It has data logging function and records up to 20400 way points. Specification GSM/GPRS: GSM/GPRS :module:Simcom300 Tri-Band GSM module (GSM900/1800/1900MHz) GSM Antenna : Build-in Protocol: Support TCP transmission GPS: GPS module :SRIF III 20 channels Protocol :NMEA-0183 compliant protocol GPS Antenna :Build-in active high sensitivity antenna Accuracy : 1-5m Update rate : 1 HZ Start time Cold start: 42s Warm start: 35s Hot start : 1s Electrical: Operating Voltage: 3.4-4.5V Charge voltage: 4.5~5V Standby :15mA Operating :80mA Battery Li-ion: 1100mAh Stand-by time: 36hours other: Product Size: 68mm*47mm*17mm Weight :55g(including battery) Box Size :17.5cm*12cm*8.5cm Weight : 260g Carton Size: 53cm*38cm*47cm(for 40pcs) Weight: 12KG