The EC 4 brushless dc motor is 4 mm in diameter. It is available in two lengths, with power ratings of 0.5 and 1 W, and is equipped with an ironless winding. Combined with the GP 4 planetary gearhead, the motor becomes a compact drive for use in micropumps, analytic and diagnostic devices and laboratory robots. It can adjust lenses, dispense fluids or position sensing devices. All units meet the ISO 13485 medical standard.