The AirTurn PED is the perfect controller for Bluetooth 4.0 (SMART READY) - equipped Mac, PC, iPad or Android Tablet. Take control of music reading, scrolling lyrics or guitar tabs, teleprompting, slide presentations, instrument effects or media control, and more. Configurations are also available for assistive technologies and common desktop document or presentation applications. Membrane touch foot switches for fast and quiet response. Thin profile - less than .7? (18mm) tall with anti-skid control on the base. Lithium ion (CR2032) battery lasts 6 months to a year. Second spare battery included in battery compartment. LED?s signal low battery and Bluetooth connection status Mode. Switch to change profiles for different uses. Note: Bluetooth 4.0 (SMART READY) required on host tablet or computer. Check with your computer vendor for compatibility. Measures (L x W x H) 6" x 4.5" x .7" (15.24cm x 11.43cm x 1.78cm). Weighs 5.3 oz. (151 grams). Works with iPad 3 and newer, Galaxy 4 and newer. (Does NOT work with original iPAD 1 and 2.) Check with AirTurn for App compatibility.