MJX Bugs 3 Quadcopter recently added smart radio transmitter alarm on their budget quadcopters. It beeps when you are low in battery and it beeps when you are about out of range. Hopefully this will reduce flyaway or low voltage cutoffs (Price Check) ■

Video here is a evaluation from the hanger, specs, video log and some fun...

Source: updates at playlist https://www.youtube.com/playlist?diydrone

http://www.youtube.com/watch?v=J2QW_NTjB1s camera mount, rubber silicon