Tough metal construction resists wear Fits 14mm counter-clockwise (negative) barrels Charge for 5 min get 1000 rounds out High-power LED Illuminators for lighting up BBs Easy to install external upgrade Can sustain tracer function for 35 RPS Built-in rechargeable lithium battery and USB charging port Battery last up to 20,000 rounds Battery Light level colors. (green, yellow, brown, red light) Threads: 11mm Positive (11mm Positive to 14mm Negative thread adapter included) In the Box 1X Tracer unit 1X Micro USB charging cable 1X 14mm CCW Thread adapter Specifications: Brand XCORTECHBuild Aluminum alloyLength 60mm (2.36)Diameter 29mm (1.14)Compatibility 14mm Counter ClockwiseColor BLACKBattery Built-in rechargeable lithium batteryBB selections Best to be used GREEN glow-in-the-dark tracer BBs only. Results may vary with other colors California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov