Get two Special Projects EVO(2-25D1) Wireless Headset Mics and have one at the ready. Great for back to back classes. While one wireless headset mic is being used the other can be sanitized and put on charge for the next trainer. The Dual EVO2-25D1 Wireless system includes 2 EVO wireless headset mics, a 16 channel Auto Scan receiver, battery charger, and all mounting hardware. Don't forget the extra windscreens that come in five packs and 4 different colors.