Real Time Tracking Portable Vehicle Locator Device GF21 mini car GPS anti-theft tracking locator Two-way Call: Address Book Number Calls with Users. Remote monitoring: a highly sensitive microphone that monitors the surrounding sound in real time in case of an emergency. Intelligent Power Saving: Turn off/turn on GPS and data upload in time. Mobile client/computer service platform, multi-control mode. GF21 GPS tracker also has a built-in rechargeable Li-ion battery. Built-in 300mah rechargeable battery Depending on tracking interval or usage, it can last for several days. The device is charged by a USB cable when power is low. With the SOS button, the user can send out a help message and call by pressing the button. With a microphone, the caller can listen to the voice around GF21, as well user can control the device to record the audio around the device.
