The Luminous USB Car Charger Key Strap is a handy, useful item your prom guests will love! Add it to the Prom swag bag and watch their faces light up--you can attach your keys to the strap, and open it up to charge your devices (cords not included) from the standard cigarette lighter ports. Available in three colors, it's easy to customize this car charger key strap; simply add your one-color imprint to one side. Customize the technology accessory for your Prom, Homecoming, or Senior Party favors. Measures 4 3/4" long x 1" diameter.