The AirTurn PED is the very best controller for Bluetooth 4.0 (SMART READY) – equipped Mac, PC, iPad or Android Tablet. Take keep watch over of music reading, scrolling lyrics or guitar tabs, teleprompting, slide presentations, instrument effects or media keep watch over, and more. Configurations are also to be had for assistive technologies and commonplace desktop document or presentation applications. Membrane touch foot switches for speedy and quiet response. Thin profile – not up to .7″ (18mm) tall with anti-skid keep watch over at 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 modify profiles for different uses. Note: Bluetooth 4.0 (SMART READY) required on host tablet or computer. Check along 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 more recent, Galaxy 4 and more recent. (Does NOT work with original iPAD 1 and 2.) Check with AirTurn for App compatibility.