MSD Ignition MSD Timing Pro Self Powered Timing Light Features: Tough and Easy To Use Extremely Accurate Inductive Pickup Is Detachable For Storage Intense Strobe Visible During Daylight Provides Stable Timing Signals Works In Rough Environments Injected Molded For Durability Height: 9.00 Width: 3.00 Length: 11.50 Weight: 1.90 lbs