This is a small infrared projector, K-Light. [Overview] ・The infrared projector K-Light is a lighting device in the near-infrared region with a peak wavelength of 940nm (nanometers). ・The LED (Light Emitting Diode) uses gallium arsenide (GaAs) compound, the most common for red and infrared light, and features stable irradiation capability and long life. [Specifications] ・LED material: Gallium arsenide (GaAs) compound (Made in Japan) ・Directivity: Narrow directivity ・Infrared wavelength: 940nm ・Infrared irradiation distance: Approximately 10m ・Power supply: DC12V / Compatible with battery boxes such as B-12 ・Battery life: Approximately 17 hours with B-12 ・Dimensions (mm): 78 x 69 (72) x 35 (47) ・Weight: Approximately 186g [Accessories] DC12V-AC adapter, Instruction manual Optional (sold separately) battery box for 8 AA batteries (B-12) (Photo 4) [Condition] I think there is no deterioration as it has only been used 2-3 times. Thank you.