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 for you to monitor the whole process and grasp the in real time. s position.Charging input InputAC110-220V50 / 60Hz; Charging output: OutputDC5.0V 300-500mA; Machine battery: 3.7V 400mAh - batteryStandby time: 12 . Working time 4-6 ; Expansion card; mini TF card(not included); Continuous talk: 150-180 minutes; Network standard: / GPRSStorage temperature: -40 C to + 85 CWorking temperature -20 Cto + 55 CHumidity range 5% -95% non-condensingGPRS: Upload 60, / IPworking voltage: 3.4-4.2V DCstandby current :: 2.5mAturn on the sound control current: 30mAtalk current: 150mA positioning time: 25 secondsMaterial: Plasticcolour: BlackPackage Contents:1 x GPS TrackerOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.