Features: Suitable for business management, family care and vehicle security Supports free smart-tracker application or cloud platform server Supports geo-fence function GPS/GSM (LBS) mobile networks positioning Alarm notified by application notification or SMS text message User-friendly free application in multiple language Low power alarm informs you to charge device Fashionable design with waterproof housing Specifications: GSM frequencies: 850/900/1800/1900MHz GPS sensitivity: -161dB Output voltage: 4.2V Power consumption: 340mA GSM/GPS antenna: internal Dimensions: 43.4 x 33.4 x 19.5mm Weight: 47g Real-time tracking History playback POI report back SOS alarm system Collar shape TBPT only