E1 A99 Golf Ball Finder Located Glasses Black Frame with Case Golf ball finder. Makes ball spotting easier Reduces ball loss; saves money;Blocks out the majority of unwanted light,easy to find ball; Save hours looking for your wayward golf balls with these specially tinted glasses. This glass finder works very well if there is green grass, while if there is yellow or light color leavels fall down every where, it won't change the enviroment a lot then make it a big difference comparing with white golf ball. The golf ball finder glasses only works when part of the ball can be seen through the gap of grass leaves, if the ball was blocked throughly by the rough grasses, please be noted the finder won't work like an ultrasonic machine - it won't help you see through the grass leaves. Warning: Intend for use during ball searches only. Do not wear as Sunglasses, cannot use in normal life.