C2G 27555 Fiber Break Tester Specifications: Wavelength: 635 +/- 20nm at 25°C Output Power less than 5 mW Spectral Width less than 10 nm Transmission: Continuous or 3 Hz pulses Range: Visibility up to 3 km Power: Two AAA 1.5 Volt alkaline batteries (included) Color: Black Length: 6.3 Weight: 0.27 lbs. Parts: 1 year limited