Energizer BTS-061 is a portable bluetooth speaker with extra power for your device. Built-in microphone allows you to directly answer calls or hold conference call when using the speaker. BTS-061 transmits the sound up to 10M, and also works with bluetooth connectivity, USB, and micro SD card. The lightweight design makes it easy to carry for the on-the-go moment. The Energizer PowerSafe Management guarantees against short circuit, overcurrent, overcharge and overdischarge for your power bank and devices.