ROCKBROS Bicycle Heart Rate Sensor Bluetooth 4.0 ANT+ Chest Wear Strap Heart Rate Monitor For Garmin Wahoo GPSPORT Bike Computer
Aliexpress UK
"Exactly as described and works well with my Tickr heart monitor. "Great service and product. Not original Wahoo product. High quality soft fabric and fully adjustable strap ensured a comfortable fit.
eBay