Receiver Crystal - $5.95 Select frequency to match your transmitter. Works with both receivers shown above. select frequency 11 12 13 14 16 17 18 19 21 22 23 24 26 27 28 30 31 34 36 38 39 40 41 42 43 44 45 46 47 48 49 50 51 53 54 56 57 58 59
Servo Connector - $2.75 Convert the Blue Arrow brushless motor controller so it will work with larger receivers. Requires soldering.