公交车上扒开腿做爰_欧美《交换做爰》_全黄做爰100分钟视频_巜交换做爰2朋友麦子3_巜少妇按摩做爰2_邻居交换做爰5

Potentiometer

Variable resistor is also called "rheostat" or "potentiometer", the pursuit of comfortable hand feeling and ease of use, there are unique tricks for types of shaft, without shaft , hollow , sliding Etc....? In the field of professional audio and car audios, the hand feeling of the potentiometer is sometimes decisive to the grade of a complete set of products.?Our products have accumulated rich achievements of more than 10 years of experiences. They are suitable for intercom volume switch, automobile power amplifier, speed controller, professional audio, sound console, electric fan, sports equipment, medical equipment, etc. Welcome to try!