Avon VPU / Powered Amp & Mic for C50 / M50 Gas Mask Includes BOTH the Avon Voice Projection Unit (VPU) (#70501/229) & comes with Gray Internal Microphone (#71601/12). Brand New – Made by Avon Protection Systems, USA. Voice Projection Unit w/ Internal. Includes the following components. VPU / Voice Projection Unit: Avon Part# 70501-229. VPU Microphone (gray internal piece): Avon Part# 71601-12. NOTE: This listing includes 1x Amp & 1x Internal Mic. That adapter is not required unless you are connecting to Police/Military Radio or External Communication System. For enhanced communication, an optional Voice Projection Unit (VPU) with internal microphone is easily connected via the Electronic Communication Port (ECP). Powered Voice Amplifier (VPU) unit connects to the front of the gas mask & Internal Mic plugs in to internal mic ECP connection. Designed for use with Avon M50 & Avon C50 gas mask (The FM53 uses a different type of VPU, also available upon request). Other items available from CBRNsystems for the Avon Protective Mask Series. US Mil-Spec Carrier / Gas Mask Pouch – listing#. Canteen cap for Drinking / Hydration System VPU Microphone (Gray Mic Only) – listing#. Clear / Hard Lens Outsert. Avon GPCF50 Conformal Filters (Curved design to fit mask contours) CBRN Approved CAP1 Filters (for C50 / all 40mm gas masks). M50 / M41 Primary Filter Pair (for M50 Only). Filter/Accessory Pouch for M50/M41 Filters (for M50 filters only). Other Avon Protection & US Military Gas Masks available from CBRNsystems: Avon S10 Respirator / Gas Mask FM12 & FM12-CBRN Gas Mask FM53 Protective Mask System C420 PAPR System & Accessories Avon EH20 Escape Hoods Smallest CBRN Protective Mask Made Today!!! Looking for JUST the microphone / mic for your VPU equipped gas mask? Information deemed accurate but is not guaranteed.