The Chroon-Tan B-Machine, also known as the EW-3 midwife droid, was a specialized medical droid capable of delivering and caring for newborn babies used in the Polis Massan medical facility. A midwife droid delivered the Skywalker twins on Polis Massa. The design of the so-called midwife droid was of a non-threatening aspect, with a friendly, blue-hued face and an array of colored photoreceptors. A warming cushion sat on the droid's bulbous, silver body, while two nutrient reservoirs were maintained to ensure the baby was well-fed. The padded droid was powered by a anti-gravity repulsorlift, located in a spherical compartment below the main body. The midwife droid was fitted with two large, soft cradling paddles for use upon delivery of the newborn. The droid's diagnostic sensors can measure its patient's heart rate, breathing rate, and blood pressure.