Concox GPS Electric Cars Positioning Terminal User Manual page 7

Note：Improperly connecting the charging cable can cause serious damage to the
device. Any damages by misuse are not covered by the warranty.
4.4 Install the device
You need to choose somewhere that it won't be found, because the whole point of
fitting covert GPS vehicle tracker is the secrecy element.
1. Your device has built-in GSM antenna and GPS antenna. During installation,
please make sure the receiving side face is up ; any high power devices such as
reversing radar, anti-theft device or communication equipment would affect the
signal of the device.
2. All metallic cases of the windshield will attenuate the signal on the tracking
device. It's simply due to the shielding effects of the metal compound of the case.
3. The device should be fixed into position with cable ties or wide double-side tape.
Installation please refers to below picture.