This little unit is powered by your receiver. It will record the peak altitude of your plane and weighs less than 2.2g.
Its dead easy to use. Once plugged in, it will zero and assume the power-up location is the ground/runway. Then after your flight, simply wave your finger over the LED and it will flash back to you the peak altitude of your plane for that flight. If your plane flew 345ft high, it will flash ***  ****  *****
Simple, no pc required, powered by your receiver and next to no weight gain for your plane.!

Spec.
Altitude range: 50 to 7,000ft (50 to 2150m)
Resolution: .46ft (.14m)
Voltage: 3.2 ~ 12v
Size: 20x15x4mm
Weight: 2.2g