Small version last 4 days on one charge
Big version have 10 days.

Specification:
Multiple Positioning Mode: GPS+ AGPS+LBS+WIFI + TF Card and APP Voice Recorder
Worldwide GSM+GPRS 4-frequency System: 850/900/1800/1900MHz
Automatic Time Update: Precise GPS time service and no manual time adjustment is needed
Track: The user’s specific location can be inquired through the cell phone APP or the computer
Fence: Designate an area on the map by setting the device as the center point and the alarm will be triggered off immediately once the user of the device goes into or out of this area
PlayBack: Inquire the moving routes of the device in the past 3 months anytime and anywhere
SOS: In case of emergency, press the SOS button and the device will send out the call and message for help to the guardian (long press power button 4 seconds)
Walk: Counts the steps the user has walked
Reward: The reward is sent out through the APP on the guardian’s cell phone and the reward progress can be viewed
Voice: With the highly sensitive microphone, the sound around the device can be heard in real time in case the emergency happens to the user
Remote Power-off: The device can be turned off through the APP on the guardian’s cell phone
Remote Restart: The device can be restarted through the APP on the guardian’s cell phone
Intelligent Power Saving: The device turns off/on the GPS and data upload in the time range specified through the APP on the guardian’s cell phone.
Map: Baidu map and Google map.