Computerised 20A speed controller for scale model boats, recommended for 540/545 & SPEED 600 type motors. Main motor drive voltage range 2 to 12 Volts. AUTOSET centre stick setting; selectable gentle/rapid acceleration. Motor stops if signal lost or receiver switched off. Screw terminal block connections for Motor and Power. External size 63.5mm x 43.5mm x 25mm (plus approx 6mm for the two heat-sinks). P80S version suits 7- to 12-pole motors. NOTE: This unit is not fitted with Battery Eliminator Circuitry (BEC).