Onn 3 foot USB Charger Cable for use with Fitbit Charge 3 Onn Brand Charging Cable for your Fitbit Charge 3 activity tracker. Slim 3 foot long USB cable in Black Color. Lightweight and convenient for on the go or at home. Plugs into any USB Port. Charge via USB wall charger, computer, laptop or any USB power adapter. Never worry about missing steps.