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.