Optimate 4 Dual Program is the latest version, The unique multistage battery optimiser specially designed for modern 12V starter batteries from 2.5 to 50 Amp-hours.
With Optimate 4 Dual Program you can now either charge the battery direct, or select the program to charge via the 12V port on CAN-bus equipped BMW motorcycles (using either the optional O2 or O9 accessory plug lead).