The Guardian ™ Pet Collar Mount Light has a built-in base specifically designed to clip on to nylon or neoprene collars. This heavy-duty attachment can be easily fastened to 1″ or 1.5″ straps, collars and webbing. Waterproof, crush-proof and sturdy, this product will ensure dogs’ safety by keeping them visible. Operational at extreme temperatures, it will not be stopped by severe weather conditions. Visible up to 3 miles away, it will even be effective in densely wooded areas. Battery Source: 6V Lithium Coin Cell Battery Pack (included) Optional Battery: 2x Cr2032 3V Lithium Coin Cell Visibility Range: 3 miles (5km) Waterproof Rating: 100 Meters (328 Feet) Operating Temperature: -20 to +60°C Environmental Seal: O-Ring Dome Lens: High Impact Polycarbonate Housing Material: High-Tech Polymer Technology: Patented Omnidirectional Optics, Reverse Polarity Program Switching® Battery Duration: (may vary with temperature) Flashing ~240 Hours Steady-On ~100 Hours