Ring PowerSource 300 Inverter +USB This is a replacement for the very popular Ring RINV300 300W Inverter and now includes a 2A USB Output Socket making it ideal for charging many USB powered devices. 12v - 240V 3 Pin UK Mains Socket, 300w Power mains equipment from a 12V source The Ring RINVU300 provides the power to run mains equipment from a 12V battery (leisure battery, car battery etc.) and is supplied with crocodile clips for operating directly from a battery. Transform your vehicle into a mobile office or home from home and never be caught short of electrical power again! Simply connect Ring PowerSource RINVU300 Inverter to your vehicle battery using the battery clips and plug in any mains appliance upto 300w Suitable for Many Electrical items needing up to 300W like: Small televisions, Camcorders, Stereos, small Fridges, Mobile Phone Charger, Games Charger, Laptop, Inkjet type printers and many other applications. NOTE: This RING RINVU300 300W Inverter does not have a cigar lighter plug, so connot plug directly into your cigar lighter socket (car cigar lighter sockets cannot deliver enough power to run a 300W Inverter) and must be connected directly to a 12V battery. The battery connection must be capable of sustaining a constant 25A load.