The battery is charged through the vehicles 12-volt socket. The connector has our intelligent comfort indicator (Part No. 56-870) which shows how much power is left in the battery.Note: The socket in the vehicle must be live when the ignition is in the off position to charge your battery using this accessory.Compatible withCTEK US 0.8,MULTI US 3300,MUS 4.3,MUS 7002,MXS 5.0Lithium US,CT5 PowersportandCT5 Time To Go.

FEATURES:

• An INDICATOR is the easiest way to monitor the charge in your battery. An accurate voltage reading for your battery is displayed two hours after youve used your vehicle.
• GREEN means the battery voltage is more than 12.65 V. No need for charging.
• YELLOW means the battery voltage is between 12.4 and 12.65 V. Its time to consider charging the battery.
• RED means the battery voltage is below 12.4 V. Its definitely time to charge the battery.