Wireless Bluetooth Mini Speaker Mushroom Waterproof Silicone Suction Handsfree Holder Music Player for iPhone Android Black Built-in Bluetooth Bluetooth audio sound, perfect sound quality and bass effect. 10M transmission distance. Support phone, ipod and other devices with bluetooth function. Bluetooth hands free function, answer call easily. Bluetooth music controlling function. Built-in rechargeable Li-ion battery, lasts for up to about 7 hours per charge.