Connects to the battery cable with the industry standard 2-pin SAE connector - inline seal makes 12V connection weatherproof! Charges 1x USB device with up to 3300mA current (or optionally charge 2 devices with O-110 USB splitter). The charging current adapts to the connected device for safe charging. Weather-resistant USB charging port, simply attaches to handlebars, strut or even brake/clutch cable with cable ties - seals inserted USB cable, for charging in any weather! The built-in protection interrupts the USB charging process and prevents your parked vehicle's LFP (LiFePO4) or AGM (Pb) battery from emptying - starts again as soon as the vehicle engine starts. Monitors and displays the battery status of the parked vehicle - indicates that the battery is "ready to start" by flashing an LED!