Both models allow the servo speed to be adjusted, 2 to 10+ seconds of travel in either direction with no loss of servo torque. Go-Slo III units are great for precise operation of Flaps, Gear etc. The receiver cable is now a heavy 22 gauge for better power delivery to one, two or three servos. Go-Slo III's are compatible with 4.8 or 6 Volt systems and all proportional servos. The unit is 1.5" x 1.5"x 3/4" and only .9 oz in weight.
The #880 version has two parallel outputs and a third output reversed. Model #881 has three parallel servo outputs. Universal connectors.