Flip Digit Raceclocks by Electro-Numerics feature reflective, yellow electromagnetic "flip" digits for viewing in bright sunlight. These models feature a rugged aluminum carrying case. They include a carrying handle and a built-in keypad to select timing modes, time-of-day, and preset times. Internal, sealed batteries provide up to 24 hours of continuous operation on a single battery charge. An internal battery charger is included with a plug-in power cord and charge indicator.