Antenna for Mobile phone: We produce rotary encoder, potentiometer and switch. Passed ISO9001,ISO14001,ISO/TS16949. Antenna for Mobile phone: We produce rotary encoder, potentiometer and switch.rotary encoder,potentiometer and switch for musical instruments, audios,medical equipment, Walkie talkie,DVD,GPS navigation,toys ,automotive accessories (car amplifiers) Volume Control ,interphone,sport ...