I use these ones:

https://www.amazon.com/Donner-Wireless-Receiver-Transmitter-Lighting/dp/B00HWM6DCS/ref=sr_1_4?s=musical-instruments&ie=UTF8&qid=1490557701&sr=1-4&keywords=wireless

Note, you get what you pay for with these. I've had great luck with them, but they are not meant to be handled poorly.