Heil RC-35 PR35 Wireless CapsuleFEATURES The Heil Sound RC 35 Screw on Microphone Capsule features the same microphone element found in the Heil Sound PR 35 microphone. The screw on capsule is intended for use with third party handheld microphone transmitters that receive a 31. 3mm pitch 1. 0mm connection. Some handheld transmitters feature a hexagonal head set screw; simply loosen the screw to install the capsule. A three conductor contact circuit board makes contact with the