Futaba MSA-10 Servo Synchronizer FEATURES: Couples up to Four Servos and electronically balances them to start and stop simultaneously for strong, smooth operation of even the largest INCLUDES: One MSA-10 Servo Synchronizer with Futaba J connector; One temporary battery channel jumper (used if no battery plugged in) One small adjust REQUIRES: Servos with Futaba J, Airtonics Z, or Hitec connectors; Installation in the model