The BOHM SoundBlock Features two 40mm, 10-watt (total) drivers and a large speaker cavity for excellent sound, this tiny but powerful speaker can fill any room with rich audio. It's Bluetooth 3.0 connectivity allows you to wirelessly play and control your music from Bluetooth devices and take calls hand-free directly through the speaker. To keep the music playing a built-in rechargeable battery lasts for up to 10 hours per charge. The SoundBlock measures approximately 6 x 2 x 1.6 inches. Use it at home, take it on vacation, enjoy it while camping, or set it up any other place you want to play your favorite music. The BOHM SoundBlock pairs instantly with Bluetooth devices like smartphones, Tablets, and computers, letting you send your favorite songs wirelessly to the speaker. Change tracks and adjust volume from your Bluetooth device, or use the control buttons located on the speaker. Check the speakers battery status on your iPhone. When the battery is low, the speaker will give you an audible warning. The SoundBlock has a transmission range of about 33 feet and automatically connects to the last device it was connected to. Features - New Bluetooth 3.0 Technology - Built-in rechargeable battery supports up to 8-10 hours playback (Standard volume) - Two 40MM drivers deliver deep, rich sound - Built-in Microphone for Taking Calls - Wirelessly Control Your Music through the Bluetooth Function - Line In input gives you a wired listening option- Audible Low Battery alerts