DOSS SoundMini Portable Mini Bluetooth Speakers,Wireless Pocket Outdoor Sport Speakers, Bluetooth 4.0 Speaker with 8 Hours Playtime,Rechargeable Battery & Handsfree(Blue) Portable Wireless speaker - whether you're having a indoor or outdoor activities,enjoy a full-range stereo sound with a impressive volume Bluetooth 4.0 Technology-Equipped with the advanced technology,compatible with all Bluetooth compacity devices.Speaker automatically reconnects to the last device used Full & High-Def Sound - Enjoy an impressively full sound quality realized through a 3W audio driver and passive subwoofer Ultra Pocket size - Incredibly compact perfectly fits into your jacket pocket or small bag suitable for both indoor and outdoor exercise Long playtime - Built in Li-Ion 1020 mAh rechargeable battery rechargeable battery, supports up to 8 hours playing time at the volume of 50%