I second the Cateye Strada Double Wireless. I have one and it works great. It's digital and not analog so there is no interference like what you get with analog wireless. I bought mine at a LBS for $89.00 USD.
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HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress