The Perfect Putter gAIMe Changer Laser
This 5mW 532 nm green laser will provide you feedback on how well you line the ball and the putter face to your starting line in seconds. It gives you the ability to trace the line up and down all the way to the hole without the necessity of having a backboard. Works great outside on bright sunny days.
Comes with a a 16340 3.7v rechargeable Li-ion battery and a charger.