Sheng Jun Electronics (a subsidiary of Rip Electronics) and Anjie Technology (a subsidiary of Xinxing Holdings) are suppliers of Tesla sensors. However, the two companies are responsible for different parts of the sensor. Sheng Jun Electronics is responsible for the original sensor, while Anjie Technology is responsible for the sensor assembly. In addition to providing original sensors, Sheng Jun Electronics also provides Tesla with window buttons and battery circuit protection systems. Therefore, Sheng Jun Electronics is one of the top ten tier-one suppliers of Tesla.