Compatible with heart rate monitors: the chest strap works with the MZ-3. Adjustable size: waist circumference 66cm (adjustable), width 3cm.Easy to use and clean: using the same snap. The sensor transmitter should be removed and the soft strap should be hand washed as often as necessary. Comfortable and Great Work: Thanks to the chest strap based on nylon material, it can be tightly attached. Soft fabrics and adaptive electrodes that are extremely sensitive to your heart's electrical signals. Note: Strap only, heart rate sensor transmitter are not included. Color: RedMaterial: NylonNote: For the heart rate band, the distance from the center of the buttons is 45mm. When purchasing, you need to confirm whether the distance of the button on the back of the heart rate module is compatible with this size. Package Content: 1 * StripOnly the above package content, other products are not included. Note: Light reflection and different displays may cause the item's color to be a little different from the real thing. The measurement error is +/- 1-3cm.