an s500 multifunctional bluetooth 4.0 + edr speaker 5-modes bright torch flashlight using aux function as a loud speakers

battery is removable, replaceable, rechargeable. the ingenious design makes its longer life and safer usage. battery can be replaced means: power is infinite, music playing time is infinite. intelligent circuit protection design. six intelligent circuit protection system design: wrong polarity, over charging, over discharging, over load short circuit, over temperature, wrong contrary connecting. it's safer to use.