男女做爰无遮挡免费动态图_牛牛视频一区二区三区_极致凌虐被迫高潮sm在线观看_九九视频免费精品视频_长谷川+先锋影音资源_五月综合激情婷婷六月色窝_6d肉蒲团奶水大战a片下载_国产成AV人片久青草影院_九九精品九九欧美成人性视频

Product parameter：

Multi functional combination foot control, with richer functions and more convenient operation.

Foot control has 8 sets of functions:

handpiece on/off, hanpiece chip blowing, oral light switch, spitting position, patient chair reset, rinsing bowl, mouthwash, chair position movement.