Model 20788 Color Black + green Quantity 1 GPS Chip MTK Network GSM / GPRS Band 850/ 900/1800/1900MHz GPS Sensitivity No-limited dBm GPS Accuracy No-limited meter Pre-loaded Map No Maps Included No Screen Size No inch Screen Format No PC Interface Supported USB GPS System Features Convenient and easy operation Operation Temperature -20'C~+55'C Storage Temperature -40'C~85'C Humidity 5%--95% (no condensation) Memory No GB Power Supply 3.7V 500mAh Other Features Great for home monitoring: children old people pe supervision monitoring car warehouse security tracking etc.; Sound control: SMS 0000 to turn off 1111 to turn on; Emergency call: SMS SOS; LBS positioning: Edit capital letters DW or GPS machine number a minute or so will return a message containing the address / latitude and longitude / URL information. Sound control dial use dual mic use IC control high sensitivity. No suitable for 3G mobile phone. Packing List 1 x GSM / GPRS position tracker 1 x EU plug power adapter (110~220V) 1 x USB charging cable (59cm) 1 x English / Chinese user manual