Bose SoundLink Mini Bluetooth Speaker II (Carbon) Big sound--with deep bass--for a full-range listening experience Wireless and ultra-compact so you can take Bose sound anywhere, Bluetooth Transmission Range Up to 30' Built-in speakerphone lets you take calls out loud; Lithium-ion battery plays up to 10 hours on full charge Voice prompts talk you through Bluetooth pairing, so it's super easy Kindly check User manual on Product Information for Troubleshooting steps