Heart rate monitor belt. Please use it as a replacement. Do not use a dryer. Compatible with heart rate monitors with a terminal width of approximately 45mm. See image 2. The last image shows everything. The heart rate monitor body and instruction manual are not included. Length is approximately 60cm when fully contracted and approximately 90cm when fully extended, but it can be stretched about 14cm with the elastic band, so theoretically, it seems to be able to be worn with a waist circumference of about 104cm. (Polar Garmin CATEYE Polar Wahoo Wahoo etc.) Compatible with various companies. Not a genuine product. Heart Rate Chest Heart Rate Monitor Strap Chest Belt ANT+ Bluetooth Ideal for training on road bikes, cross bikes, mountain bikes, e-bikes, such as those from various manufacturers including Specialized, Cannondale, TREK, MERIDA, GIANT, Bianchi, PINARELLO, COLNAGO, as well as for hill climbs, indoor training, cycling, leisurely rides, commuting by bicycle, Zwift, long rides, endurance races, and gran fondos. Heart rate management also leads to diet, weight loss, stamina, health management, and maintaining motivation. Marathon runners, ekiden runners, sprinters, jogging, trail running, and heart rate monitors for other sports can also be worn if they fit the approximately 45mm width. Although it is new, due to being a foreign product, there may be minor scratches, scuffs, or fraying during the manufacturing process that may not meet quality standards. If you are concerned, please refrain from purchasing. Package, box, and instruction manual are not included. It will be shipped in a simple brown envelope. If you are concerned or are a perfectionist, please refrain from purchasing.