Features: Low battery alarm reminds you to charge the positioner in time. It can alarm in the set area, so it is easy to find people quickly. Intelligent sleep mode saves energy and extends service life GPS function to receive GPS signals faster, mobile alert. Add waterproof and dust-proof features, add rolling call location feature, and it can be controlled by mobile app. Specification: Condition: Brand New Color: Black Material: ABS Size: Approx. 47 x 23 x 18mm/1.9 x 0.9 x 0.7in Weight: Approx. 25g/0.9oz Network: GSM / GPRS Frequency Band: 850/900/1800 / 1900mhz GSM Chip: MTK6261d GPS Chip: 7020 Gps Sensitivity: -159dbm Gps Accuracy: 5 Meters Working Voltage: 3.6V~5V DC Battery: Rechargeable 3.7V 600mah Lithium-ion Battery (Included ) Storage Temperature: -40°C To +85°C Operating Temperature: -20 ° C To + 55 ° C Humidity: 5% - 95% Non-condensing Package List: 1 x GPS Locator 1 x USB Cable 1 x Card Holder Accessories 1 x Instruction Manual 1 x Lanyard