20W 12V Solar Panel Car Battery Charger Portable Waterproof Power Trickle Batter
The 20 W trickle charging mode is an ideal choice for low-cost maintenance of your 12 V battery power. Charging Visualization:The indicator lights are used to help you understand the charging status: the blue light is on (in the sun), the red light is on (charging), the green light is on (charging completed), three indicator lights are off (a short circuit occurs).