Sheave Alignment Laser Accuracy +/-1/16 in @ 10 ft Battery Type AA Bluetooth Not Bluetooth Compatible Features Accurate Drivetrain Alignment to Reduce Power Losses Friction Bearing Wear and Noise Detects All Methods of Drivetrain Misalignment Including Offset Angle and Twist Greenbrite(R) Technology - 400 Percent More Visible than Red Lasers Includes Pulley Offset Chart to Determine Misalignment Angle Includes Case Target Number of Beams 1 Number of Planes 0 Number of Dots 0