Turn up the sound with this portable speaker. Bluetooth wirelessly streams audio from an enabled device. Up to 4 hours of playtime on a single charge. Built-in FM radio. USB and microSD card inputs support music files. True Wireless Stereo - connect 2 speakers for surround sound. Supports hands-free calls with built-in mic. LED flashlight makes the speaker perfect for hiking camping and more. Speaker size: 52mm. RMS Power output: 3W. Built-in rechargeable 5V 1200mAh battery. Frequency range: 50Hz-10kHz. Charging cable included.