partying, camping, hiking or biking.Bluetooth 4. 0 Technology: Equipped with advanced technology and compatible with all Bluetooth devices. The speaker also remembers your last device, allowing you to reconnect effortlessly.Extended Playtime: Built-in Li-Ion 2200mAh rechargeable battery s up to 12 hours playtime at 75% volume. Recharge in 3-4 hours with the included micro USB cable. Reminder: This product is designed, manufactured and exclusively sold by DOSS.