This device will be your best friend on the golf course. It has 38,000 preloaded courses already on it worldwide with free course updates. It measures accurate distances from the front, center, and back of the green. Shot distance measurements, and a digital score card. It's magnetic so it hooks onto your golf cart for a hands-free experience. A rechargeable lithium-ion battery that lasts 16 hours, a micro USB charging port, and it's water resistant. Please feel free to comment with any questions.