Optical system viewing direction: direct view Field of view: 80~105 Focal lens: fixed Outer diameter: 8mm Bending angle: 2ways /4ways 90~120 Working length: 2m / 2. 5m / 5. 5m / 6. 5m / 8m Monitor: 6. 4" lcd Iilumination method: halogen lamp / metal halide lamp Bulb life: 500 hours Power supply: 120~240v ac or build-in 18v dc batteries S/n: > 49db White balance: manu Video format : pal/ntsc Light source: led / halogen lamp / metal halide lamp Output: video(bnc / rca jack )