【2 IN 1 MICRO USB CABLE CHARGER WITH HIGH CONVERSION EFFICIENCY 】No need charger, it makes more convenient and high-performance than the tradition charger. It can charge either two batteries simultaneously or 1 battery from any USB power source, making it the perfect charger for travelling or road trip. 【WIDELY COMPATIBILITY 】It works with a wide range of devices. Ideal for Wireless microphone, Wireless video game controllers, Electronic toys ,Smoke/Fire alarms, Metal detector, Remote controller detector, Electric 9v guitar, Professional audio, Paintball guns, GPS, LED lighting devices , Walkie-talkie, Multimeter, Home security devices, Medical devices etc. 【MULTIPLE CHARGING OPTIONS 】 The chargeable batteries have no memory effect, low self discharge and can be charged anytime. It can be connected with most USB source like PC, car charger or power bank etc for added charging option. It is easy to know the charging status with the led light indicator.( NOTE ): The 9V Li-ion battery's full voltage is 8.4V , its voltage range is between 6V-8.4V. 【SAFETY】 9 Volt lithium rechargeable batteries passed the CE certification . It features four layers of protection (over-charging, short-circuit, high-temperature, and surge protection) with a high-quality, Fire-resistant construction. BATTEREIS WILL REACH TOP PERFORMANCE AFTER 3-5 TIMES FULLY CHARGER CYCLE.