Tempdrop 2 fertility monitor with 2 bands (one band is new in box). This is their newest model. These are the new navy bands. Both bands are size M and have an extender included. Lightly used and works perfect. Purchased 10 months ago. Selling because I never use it; worn about 10 times and is in excellent condition. Includes instruction booklet, box and sensor unlocking tool. It has original battery.