Bluetooth uses the FHSS (Frequency Hopping Spectrum) method, which usually hops 1600 times per second and divides the 83.5mhz frequency band into 79 frequency band channels, each occupying only 1MHz of bandwidth. The modulation method is GFSK (Gaussian Frequency Shift Keying), and the communication distance to wireless data and voice is generally 10 meters. The transmission distance of the latest version of Bluetooth 4.0 in April can reach 50 meters. Nowadays, the Bluetooth function can be integrated into various digital products, such as mobile phones, headsets, printers, button mice, cameras, etc.
GPS light sleep, which is artificially set to send GPS location information at a fixed time every day and a fixed time every day. The purpose is to prevent detection and save battery power (for example, GPS power), such as gps jammer with special equipment The equipment, the casting machine is locked in the GPS GSM kaka, and then activated by the equipment, it continuously sends SMS or call number to make the equipment in the signal transmission state, and emits 900~910 frequency band signals. According to the detection method 1, a handheld signal detector can be found.
If someone else has a GPS tracker installed, someone else wants to check your location remotely. Go to the electronic market and buy a device that can track your cell phone signal. Take this thing and search in your car. You can quickly find the installation location! Or go to the electronic market to buy a mobile phone signal or GPS jammer, it is not very expensive, so no matter how it is installed, no one can find your location! The tracker needs power, if it is a built-in battery, then if you don’t want to find it easily, it won’t be too big. It is a cigarette lighter and obd II.