Charge Amps: 2.8A constant current. Charge stages: 6, fully automatic Battery range: 12V 7Ah to 120Ah STD/filler cap, sealed AGM & GEL. Low voltage start: 2 Volts. Saves batteries: Yes, 1 desulfation stage. Weatherproof: Yes, sealed enclosure with built-in wall mounts. AC supply: OptiMate 5 model TM-221 accepts global supply between 100 to 240V 50/60Hz. Fitted with North American 2-pin AC power Cord. Features: OptiMate 5 with 2.8Amps is the ideal all in one tool to care for your cruiser motorcycle, boat or car battery. Ideal for away-from-home emergencies, lightweight, only weighs 1.1pnd / 500g including AC power cable and charge cable. OptiMate 5 will diagnose, recover, charge, test and maintain your batteries automatically. Forgot to switch off the ignition / lights or did not hook up the battery to a maintainer during off-season and now the battery is 'dead'? There is no need to rush out and buy a new battery as OptiMate 5 has been proven to save neglected, deep discharged batteries other smart chargers can't. Want to ride your touring / cruiser motorcycle, but the battery is flat? Recharge a typical cruiser / touring bike battery (20Ah) to 50% or more, sufficient to crank the engine, within 5 hours.Think that batteries only last 2-3 years? OptiMate 5 has been proven to extend battery life to 400%; batteries can last 8 years if maintained with OptiMate 5. To make this work always hook up OptiMate 5 to the battery when the vehicle is parked and it will safely maintain the battery at 100%, never overcharging, thanks to its unique 30 min charge, 30 min rest cycle during every hour of long-term maintenance charge. SAFE: Fully automatic operation that includes all safety features such as reverse polarity protection, no spark connection : approved to UL & CSA safety standards for automatic battery chargers. Included accessories: Fused battery connector with weatherproof cap (O1) & a high quality set of battery clips (O4).