Dynamite Dyna-Glow glow driver uses "C" size alkaline battery and the Metered Locking glow drivers let you easily see if the Dyna-Glow is drawing a current when attached to the glow plug. The Dyna-Glow glow driver features a durable red-anodized aluminum case. The Sure-Lock glow plug attachment secures the Dyna-Glow around the body of the glow plug for hands-free starting. The contoured Comfort-Grip finger clip makes installing and removing the Dyna-Glow easy and virtually slip-proof.