The Nikon LASER 550A, with its waterproof function, is a golf rangefinder capable of precise distance measurement. ＜How to Use＞ The large button in the front is for power and distance measurement. The small button in the back is for switching distance display (yards, feet, meters). - Brand: Nikon - Model Name: LASER 550A - Waterproof Function: Waterproof - Size: 45mm Condition: Beautiful condition With slope function The battery has been replaced with a new one, so you can use it with confidence. Thank you for viewing.