SportPlus Bluetooth 4.0 Chest Strap Heart Rate Monitor for iOS (From 7.1), Android (from 4.3) and Windows Phone, Optional with ANT+ And 5.3 Khz : Amazon.co.uk: Sports & Outdoors
Wrist vs chest strap heart rate monitor: which is better for you? | Cyclingnews
Heart Rate Monitor Chest Strap Bluetooth Wireless Heart Rate With Chest Strap Health Accessories (bluetooth&ant+) | Fruugo UK
HiFiT Heart Rate Monitor Chest Strap, ANT+Bluetooth 5.0 IP67 Waterproof Heart Rate Sensor with Chest Strap for Sport Running Cycling Gym and other Sports, Works with Fitness Apps, Cycling Computers : Amazon.co.uk:
GO-HRM | Bluetooth Heart Rate Monitor with Chest Strap – ARMOR-X