Recommend the following other brands to you:
Huikang, New Element (Zhi Heng), Haibin, Meijian, Jingcheng, Xixin, Zhongjia, Teri, Nanjing Kam (Shanghai Jiaotong University), Xingkang, Meishi, Huale, etc. Ultrasound positioning of the price ranges from 3W-7W.