Features: High sensitivity, new technology and latest GPS SiRFStar III chipset Protect child / the old / the disabled / pet etc Locate the locator holder by the mobile phone via SMS This has a builtin Mic and can be used as a "silent listener" without letting the carrier know that the conversation has been listened. Powerful magnet + waterproof design, can be adsorbed in the hidden place of car SOS button send out exact location for immediate rescue/action. Compact, easy to carry, and comes with a magnetic battery cover to attach to any steel object Indication changes when power is on / off, the lamp twinkles means that there is GPS signal Specifications: Content:Specification GSM Chip :850 / 900 / 1800 / 1900 Mhz Dimension:64mm x 46mm x 17mm(1.8"*2.5?0.65? Weight:50g Network:GSM/GPRS Word Band:850/900/1800/1900Mhz GPS chip:UBLOX GPS sensitivity:-159dBm GPS accuracy:5m Time To First Fix:Cold status 45s Warm status 35s Hot status 1s Car Charger:12?4V input / 5V output Wall Charger:110?220V input / 5V output Battery:Chargeable changeable 3.7V 800mAh Li-ion/battery Standby:80 hours Storage Temp.:-40°C to +85°C Operation/Temp.:-20°C to +55°C Humidity:5%--95% non-condensing Package contents: 1 x GPS Tracker 1 x Extra Back Cover with Magnet 2 x Rechargeable 3.7V / 850mAh Li-ion battery 1 x USB Cable 1 x DC charger 1 x Waterproof Bag 1 x User Manual 1 x GPS tracker charger 1 x CD ROM