1.1. Product physical characteristics requirements detailed parameter remarks Product size 34 * 22 * 14mm waterproof IP54 shell material ABS 1.2. Power parameter parameter type requirements Remarks Working voltage 3.7-4.2V Battery capacity 350mAh Battery charging Support USB charging Average working current <50mA Sleep current <4mA 1.3. Remarks on the type of communication parameters Remarks Network standard GSM / GPRS communication frequency band GSM: 850/900/1800 / 1900MHz Transmission mode TCP / IP protocol antenna GPS and GSM antenna built-in 1.4. Positioning parameter parameter types Remarks positioning WIFI + LBS positioning accuracy (CEP50) ≤15m