Thank you for viewing our products. Immediate purchase is welcome. Thank you. Body size: Approximately 28mm x 29mm x 143mm / Weight: Approximately 150g / Body color: Gold Built-in rechargeable lithium-ion battery (3.7V 2600mA / USB charging, Type-C compatible) - USB Type-C cable included Battery life: 2 hours of continuous lighting / Waterproof: IPX7 class (completely waterproof) Light source: 1 UV LED / UV intensity: Approximately 17mW/cm2 (measurement distance 20cm) / Wavelength: 365nm * Press the switch until it "clicks". Do not leave it in the lit state. Do not look directly at the light source. Because it emits strong UV light, there is a risk of blindness or eye damage.