Clip onto clothes or wear as an armband Switch between Flashing and Steady-On by flipping the battery Visible from all directions (omnidirectional) Extremely durable, temperature resistant and waterproof Includes attachable Belt Clip and Stretch Arm Band High-visibility equipment is a must for a safe night-time jog. The Guardian™ Running Light helps ensure you will be seen when it counts. 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