Brand TWINMASK Model MT-100 Color Black Quantity 1 GPS Chip U-blox GPS / Telit (Glonass+GPS) MT-100G Network GSM / GPRS Band L1: 1575.42 +/-10MHz GSM/GPRS Module GSM: 850/900/1800/1900MHz GPS Sensitivity -161 dBm GPS Accuracy <10 (2D RMS) meter Warm Start Time 35s Cold Start Time 39s Hot Start Time 1s Antenna Built-in Pre-loaded Map Yes Maps Included Google Maps Screen Size No inch Screen Format No PC Interface Supported USB 2.0 GPS System Features Waterproof; Two way communication; Background voice surveillance; With back clip Operation Temperature -20'C~55'C Humidity 5%~95% non-condensing Altitude Limit 5000 meters Velocity Limit 514 meters per second Memory No GB Memory Card Type TF Max Extended Capacity 2GB Power Supply EU plug: AC 100~240V output: DC 5V / 1A; Car charger: DC 12~24V output: DC 5V / 1A Battery Type Lithium polymer battery (3.7V 900mAh Battery Standby 120 Hour Other Features Interface: 1 x TF card slot; 1 x SIM card slot 1 x Micro USB; Waterproof: IP67; MT-100 which is also special development waterproof function besides a general bracelet GPS tracker basic functions two-way communication listening in the background as well as wristband cut-off-proof alarm function for Parolee. It is suitable for the elderly children patients parolees and individual workers. It is easy to take such as handheld placed in the pocket or backpack; Power saving mode long battery standby; Supports setting 5 authorized cell phone numbers; Track by demand; Track by interval; Track by mobile phone& online tracking system; Real-time tracking; SOS alarm; Geo-fence alarm; Built-in G-sensor; Over speed limit alarm; Low power alarm; Vibration alarm; Wristband cut-off-proof alarm; Supports data logger in no GSM signal area using MicroSD card (Max: 2GB); Supports FOTA Packing List 1 x GPS tracker 1 x Back bracket 1 x Earphone (138cm-cable) 1 x AC power adapter (EU plug / 100~240V) 1 x USB softdog cable (100cm) 1 x Charging cable (149cm) 1 x Car charger 1 x Screwdriver Manual: http://m5.img.dxcdn.com/CDDriver/CD/sku.202008.pdf