The most ADVANCED & TRUSTED battery charger in power sports! OptiMate 4 Dual Program includes two charging programs, program 1 is for direct charging of a battery, program 2 allows safe and unsupervised charging through a BMW motorcycleâs CAN-bus controlled 12V socket. OptiMate 4 Dual Program tests before & after charging and can recover a âdead-flatâ battery from as low as 0.5 Volts. Special features in CAN-bus program: Automatic KEY-LESS activation and continued maintenance until charger is disconnected. Safe low voltage pulse desulphation. Features CHARGING AMPS : 1A (constant current) USE : Indoor / Outdoor (lowest temperature: -40Â°F / -40Â°C). SAVE : Low Volt Start of 0.5V + 2-step* desulphation recovery (*1-step low volt pulse save during CAN-bus mode). IDEAL FOR : STD, AGM & GEL 12V batteries from 3 â 50Ah. INPUT : Global (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed. STYLE : Weatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector. Weatherproof battery lead & standard battery clip set included. SAFE No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected. 3-year limited replacement warranty.