How High Altimeter Precision Altimeter 1 Metre Resolution Reports maximum altitude for a flight up to 2150 m above ground level No computer (or any other equipment) required Easy to Install Mounts inside your model's fuselage Requires only a 1/8" hole for the Light Emitting Diode (LED) Plugs into your receiver or any 3.2V to 12V battery Simple to Use Wave your finger over the LED for Altitude Report Simply count the flashes: flash-flash flash-flash flash = 221 Metres. Works in Any Model Plane Smaller than a Postage Stamp; only a few grams weight. Great for Free-Flight A Must-have for R/C Gliders View Instruction Sheet (450KB) Price: (USD) $49.50 Shipping from: $1.76 In stock now