UHF BAND RECEIVER 400-480mHz, analog and digital. DISPLAY AND FUNCTION KEYS Large easy to read backlit display with full adjustability with button locks prevents unwanted changes and channel presets to navigate with ease to your common channels you are listing too.. RUNTIME 4-5 hours varies with volume setting. XTREME SPEAKER AMPLIFIER Copy, loud and clear Rugged's proprietary electronic speaker amplifier combined with the included stereo earbuds provide superior volume and voice clarity.. FAST USB CHARGING Ready to Race Be race-ready at the track with the fast USB charging and long lasting Lithium-ion battery. Never buy batteries again. RACE CONTROL AUDIO PRIORITY Stay in communication The receiver mutes 2-way radio audio, giving Race Control audio priority so the driver never misses critical race communications when used with CS-NITRO-ADPT-2..