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Echo 1 Madbull Chronograph. * Pre-set B.B. weight v.s. energy (Joule) 0.20g .023g 0.25g 0.30g 0.33g 0.43g 0.89g * Self-supply internal sensor light source. You can use it indoors or outdoors. Day time or night time. * Extra large size diameter, (20mm. You can even measure the velocity of paintballs. * External Barrel Adapter for aiming straight. * Using 6F22NT 9VBattery. * Auto shut down in 120 second to save battery life. * Blinking when low battery * Handheld small size: 12.5*5.5*5cm * Tri-pod adapter on the bottom. * 6061T6Aircraft aluminum. Extremely durable.