Support Bluetooth & Wireless transmission. Built-in Microphone, enjoying hand-free call. Adopt high quality audio decode chip, perfect sound quality. Built-in charging battery and high sensitivity microphone. Can be sucked on back side of cellphone, for iPad or other tablet, work as a speaker and stand holder. Special suction cup design, can be sucked on any flat surface including desk, wall, window, etc. Unique water-proof design, enjoy music while taking shower, or anytime anywhere you want.