NIUNIU [Power]: Use 3 AAA batteries as the driving power (battery not included) [Switch mode]: Tail button switch [Lighting time]: 6-8 hours Working voltage: 4.5V Application fields: 1) Medical devices 2) Disinfection and sterilization 3) Ink curing 4) Detection of metal cracks and cracks 5) Photocatalyst light source, 6) Banknote checking and counting equipment, 7) Anti-counterfeiting industry, 8) Medical measurement and biometric detection 9) Hydraulic leak detection. 10) Take amber photos, catch scorpions, check tickets. 11) Nail art and more. Delivery Quantity: 2pcs, Size: barrel length 87mm, head diameter 26mm, tail diameter 26mm Color: black+red Kind tips 1. Package content: only the above package content, excluding other products. 2. The size is measured manually, please allow 1-2 cm measurement error. 3. Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.