Feature:1. INT Automatic Mode: Press the white button on the top of the laser, the laser head at the front of the putter sight will shoot a red laser, and will go out automatically after 10 seconds.2. CON Constant Power Mode: The laser is emitting red laser line that is always on and not off, and it is used when adjusting the laser angle.3. Laser Aiming Straight Line: Red laser aiming straight light path, correctly lock the flagpole, grasp the distance, and hit the ideal number of shots.4. Ultra Long Battery Endurance: 3 button batteries, ultra long endurance of electric power, pull out transparent insulating sheet, and the laser will be powered on.5. Sight Adjustment: The sight head can be rotated. Adjust the laser sight so that the laser line is perpendicular to the club head by 90 degree, and then use the practice putter.Specification:Item Type: Golf Putter SightMaterial: ABSGross Weight: 74g/2.6ozBattery Type: 3 button batteriesBattery Capacity: 450MAH, shipped with built in batteryPurpose: Assist in putter practice, correct wrong path, improve putting, straight, stable, accurate.Package List:1 xGolf Putter Sight