Up To 4X Better Visibility The GLL 3-80 CGâs green laser technology provides up to 4x better visibility than red laser lines. Bluetooth-Connected Smartphone App Using the app, enable standby or receiver mode, turn on individual laser lines, or adjust power settings, check for calibration warnings, and more. CAL Guard Monitoring for High Precision Ensure the device is always correctly calibrated using the Bosch-developed CAL Guard monitoring system and view calibration warnings in detail using the Levelling Remote App. Self-Level On Uneven Surfaces The device reduces the need for manual adjustments by self-levelling on uneven surfaces up to +/- 4° in under 4 seconds. More Laser Lines For Higher Efficiency The deviceâs 1 horizontal and 2 vertical 360° lines can be used simultaneously or turned on one by one and make it simple to work in tandem with colleagues using just one device.