No matter the alarm locator is placed on the car, in the children's schoolbag, the elderly's pocket, or valuables bags, you can send mobile phone SMS instructions to the alarm locator via your mobile phone to query the location of the alarm locator. Which is convenient to monitor the whole process and grasp the target in real time. s position. Charging input InputAC110-220V50 / 60Hz; Charging output: OutputDC5.0V 300-500mA; Machine battery: 3.7V 400mAh Li-ion battery Standby time: 12 days. Working time 4-6 days; Expansion card; mini TF card(not included); Continuous talk: 150-180 minutes; Network standard: GSM / GPRS Storage temperature: -40 C to + 85 C Working temperature -20 Cto + 55 C Humidity range 5% -95% non-condensing GPRS: Upload 60, TCP / IP working voltage: 3.4-4.2V DC standby current :: 2.5mA turn on the sound control current: 30mA talk current: 150mA GSM positioning time: 25 seconds Material: Plastic colour: Black Package Contents: 1 x GPS Tracker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.