This is a dog light from the brand Orbiloc, made in Denmark. This is a great set including the light, which retails for 3630 yen, and a battery replacement kit, which retails for 550 yen. We are very sorry, but please refrain from price negotiations. "Orbiloc" is designed and manufactured in Denmark. Production outside of Denmark was abandoned because quality could not be guaranteed. This shows that the company takes strong responsibility for its products' quality. This is a highly functional light for dogs. ・Emits light that can be seen from 5km away. ・Waterproof up to 100m deep. ・Durable and can withstand 100kg of impact. ・Can be used in temperatures from -40 to 50℃. ・Can be used for 100 hours in constant-on mode and 250 hours in flashing mode. Of course, the battery can be replaced. Switching between flashing mode, constant-on mode, and off is easy, just by turning the selector. The light is designed to be highly visible. It is waterproof to the "IPX8" standard, so it's safe in the rain. And it has a robust construction that can withstand 100kg. Easy to attach and detach. Two types of belts are included: a Velcro type and a rubber type, so you can attach it to a collar or harness of your choice. I have attached installation images in the third image. Please refer to them, although they are different colors. A white light is installed on the handle of an IDC Power Harness. (The fourth image is a photo of the light on. The white light appears white to the naked eye, but when photographed in the dark, the color of the light in the image appears bluish. Please use it as a reference for the intensity of the light rather than the color.) The materials are as follows: Lens: Polycarbonate Body: Polyamide, Polyacetal Rubber strap: Silicone rubber LED: SMD LED Battery: CR2032 (coin-type lithium battery) x 2 For those who want two or more of the same color. We may be able to accommodate you. Please comment and ask.