Waterproof function without antenna type GNSS external power supply integrated power supply interface form Chinese text English type portable. Features: Small size and light weight, easy to carry. Black shell, perfect for tracking vehicles, teens, wives, the elderly or the active. With two strong magnets in-side, easy to firmly attach to the vehicle, no need for additional installation. All you need is a working SIM card (not included!) To insert into the device, then you can track and map (with google-Maps) in real time on the internet. Call the number of the SIM card, then you can hear the voice around this tracker, without light and noise, you can know and on what is happening around the tracker silently and secretly. Voice recording function: send 555 text message to SIM card number, it will reply "Snd" message and start recording, SIM card and TF card are not included.