Tong
The GBJ802 is a cell phone control part made by Yangjie Tong. It is used to detect certain types of problems and alert users of the fault. This part has a built-in screen, which can display the fault information in Chinese or English. It supports mobile handsets of GSM networks, including CDMA, WCDMA, and TD-SCDMA. It also has a built-in buzzer, which can emit an alarm sound when a fault is detected. Furthermore, the GBJ802 can communicate with the cell phone via Bluetooth or USB cable. It can detect a variety of faults, such as low battery, unlocked SIM card, overload protection and more.