Standalone digital variometer with speed to fly. Standard dimensions 57 mm with depth only 50mm. Extremely bright 2 inch (5 cm) color display readable in all sunlight conditions with the ability to adjust the backlight. One rotary switch (knob) with push button function is used for input. Pre-loaded polar database for almost all gliders. Mechanical needle driven by stepper motor indicating vertical speed. Many custom audio settings. 100Hz sampling rate for very fast response. Internal speaker. Power input 6-16 V DC. Power consumption typical 110mA. Weight 156 g.