This is a GARMIN GPS golf watch. Approach S20 During a golf round, it displays the remaining yardage to the center of the green, and as it's a wristwatch type, it's easy to carry and very convenient to use. It's rechargeable and works without any problems. A USB charging cord is also included. The following is an excerpt from the manufacturer's manual: Stylish wristwatch design, high performance on the course. Elegant watch design, high-resolution display, a combination of golf functions and lifelogging¹ Automatically records shot distances with the AutoShot round analyzer. Improves swing stability when combined with the Garmin TruSwing™ J sensor, which measures swing data. Automatically and freely updates frequently played courses. Receives incoming calls, texts, and other alerts with notification function²