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Specifications:Model: M05 Shell material: plastic Watchband material: silicone Battery capacity: 400mA Watch size: 50*40*15 Watchband length:210mmScreen size: 1.44 Inch Touch Screen Color: blue, pink Watch optional language: Chinese, English GSM main chip: MTK2503, main frequency 158MHz GSM main frequency support: 850/900/1800/1900 four frequency GPS chip: built in Beidou chip: built in GPRS:class12 Beidou /GPS signal: BD21561.098MHz/L11575.42MHz C/A code GPS channel number: 22 channels AGPS fast positioning time: cold start 26 seconds Compass /GPS chip receiver sensitivity: tracking: -165dBm, capture: -148dBm Beidou /GPS positioning accuracy: 5-15 M LBS base station positioning accuracy: 100-1000 M Average operating current: about 55mA Average standby current: less than 3mA Operating temperature: -20 ~ 70℃ Working humidity: 5% ~ 95% no solidification Testing and certification: through the national CTA certification, 3C and CE certification GPS aerial: built in high sensitivity ceramic aerial GSM aerial: built in aerialOperating system: MTKOnline query location: computer or mobile terminal to install the appropriate softwareSIM card: single cardLithium battery charging circuit: supportLithium battery charging protection: supportUSB interface: supportPackage includes:1 x Children's Smart Watch1 x USB Cable