Cardio EAR CLIP Heart Rate Pulse Meter Sensor for cardio fitness equipment Accessories heart rate monitoring Connect to sports machines: Stepper, Treadmill, etc. Connect to for iOS/Android phones with receiver Connect to the USB heart rate box Specifications Colour:black Material:ABS Size:line length 130cm Package Contents: 1 * Ear Clip Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.