Features: brand new and high quality for -xtreme bluetooth-compatible speaker. High rate of polymer rechargeable batteries. It can be recharged repeatedly. This product does not contain harmful substances such as for mercury, lead, cadmium, etc, meets environmental for protection requirements. Upgraded recharge lithium battery. Voltage: 7.4V; Typical capacity: 5000mAh; Weight: approximate 176g/6.21oz; Specifications: Battery:7.4V 5000mAh Lithium Battery Size:146.6 x 33 x 17.9 mm/5.77x1.3x0.7in Rate:37.00Wh Color:Blue Net Weight:176g / 6.21oz Package Includes: 1x Lithium Battery note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.