Quad Lock Heart Rate Monitor with Bluetooth 4.0, Black Connect the Bluetooth Heart Rate Monitor to your smartphone, The Perfect Training Companion Wirelessly communicates your heart rate to your smartphone Comfortable, adjustable, and hand-washable chest strap Great for jogging, cycling and working out at the gym Compatible Smartphones: iPhone4s, iPhone5/s iPhone5c, GalaxyS3 and GalaxyS4 plus many more