Product Features Identifies three signal frequencies for diverse utility. Features a direction indication function for precise optical fiber direction identification. Includes a red light source and LED light with a stable, strong beam focus for effective cable detection. Ergonomically designed for easy handling; simply press the back trigger switch to clamp the fiber cable and initiate the test automatically. Compatible with fiber cables of 3.0mm, 2.0mm, 0.9mm, and 0.25mm diameters. Specifications Wavelength range: 800-1700nm Optical fiber cable types: 3.0mm/2.0mm/0.9mm/0.25mm Recognition signal frequencies: 270Hz, 1kHz, 2kHz Sensitivity range: +10 to -50dBm Output wavelength: 650±10nm Output power: >10mW Battery requirement: 2 AA batteries (not included) Size: 24 x 4.5 x 2.8 cm (9.45 x 1.77 x 1.1 in) Packaging Includes 1 Identification device 1 Storage bag 1 User manual