The HUDY Personal Racing Display is a compact all-in-one data center for professional RC car drivers, allowing you to record pertinent data for your set-up sheets. The display features large character and symbols for quick and easy readings. Aside from all of the data information, the built-in adjustable alarm clock can be used to notify you of your next heat or run. Powered by AAA 1.5V battery (not included). A “must have� device for serious racers. � Indicators for time, temperature, humidity, date, alarm � Environment comfort display: comfort, wet, dry � Temperature range: 0�50°C (32�120°F) � Humidity range: 30�90% � Temperature shown in °C or °F � Max & Min temperature and humidity memory � Time indicator in 12hr or 24hr clock � Extra features: date, alarm clock