The Spektrum S120 USB-C Smart Charger features Spektrum Smart Charging technology in a small and simple to use platform. This 20W charger easily charges compatible Spektrum Smart batteries conveniently from almost any USB power source. When a Spektrum Smart battery is connected, the S120 immediately detects the battery information and automatically begins to charge. Spektrum Smart charging is designed to be safe, intuitive and convenient so you can simply look forward to putting your batteries back to action! Charging is easy with the Spektrum S120 USB-C Smart Charger. Simply use the included USB cable to supply power to the S120 Smart Charger from a USB power source (not included). Plug in your Spektrum Smart battery (Lipo versions require the balance lead to be connected as well as the main lead) and the charger will automatically start charging. Monitor your charging status via a blinking purple or yellow LED. Once your charging is complete the LED will glow green. Please note that the Spektrum S120 Charger will ONLY CHARGE 2-3 cell SPEKTRUM SMART LiPo/LiFe/LiHV and 6-7 cell SMART NiMh Batteries.