Here is a clip-on speaker that helps you perform better on a golf course. The GoGolf GPS pairs to your smartphone device and lets you know the distance to the center of the green and your last shot audibly with the touch of a button. It works over 30,000 courses.
The device is lightweight and easy to clip to hats and glasses. The companion app is available for iOS and Android devices. It shows you an aerial view of the course. You can use the device as a Bluetooth speaker to listen to music and everything else.[where to get it]