Energizer BTS-103 is a portable bluetooth speaker with extra power for your device. The built-in microphone allows you to directly answer calls or hold conference call when using the speaker. BTS-103 transmits the sound up to 10M, and also works with bluetooth connectivity, AUX, USB, and micro SD card. The premium leather strap makes it easy to carry and hang on a hook or backpack. The Energizer PowerSafe Management guarantees against short circuit, overcurrent, overcharge and overdischarge for your power bank and devices.