Thank you for viewing our product from among many sales pages. 【Charging Precautions】Due to safety specifications (safety mechanisms), using high-power charging adapters or cables designed for rapid charging may prevent charging. In such cases, please use the included cable and a charger of 10W or less to check if charging is possible. 【Troubleshooting if Charging Fails】If the light only turns red, or if the light is dim even when charging, there is a possibility that it is not charging correctly. In such cases, please use the included cable and a charger of 10W or less and confirm that the charging lamp lights up red. (※If the charging lamp lights up green immediately after plugging in the cable, it is not charging.) 【Light-Up Collar】The LED light shines brightly. For single colors, press once for fast flashing, twice for slow flashing, and three times for constant light mode. For rainbow colors, press once for fast flashing, twice for slow flashing, and three times for a flowing rainbow light. There is no constant light mode for rainbow colors. 【5 minutes of charging provides up to 90 minutes of use】Quickly charge before a walk for sufficient lighting time, making it easy to prepare even if you forgot to charge. 【USB-C Type】USB-C Type charging allows for fast charging, with a full charge in 15 minutes providing up to 5 hours and 30 minutes of use. (Always use the included cable and a 10W or less charger when charging. Please note that rapid charging adapters and cables cannot be used.) 【Waterproof Specifications】Water-resistant, allowing for safe use on rainy days. (※Not waterproof; do not submerge in baths or pools.) 【Lightweight and Comfortable for Dogs】At 26g, the lightweight design won't burden your dog. 【Cuttable with Scissors】Easily adjustable by cutting with scissors. (Supports collar inner circumference of 35cm to 27cm) 【Important Notes】※① Cut the side with the scissors mark. Cutting or removing the opposite side will prevent the light from working. ※② Cut in small increments to avoid the collar becoming non-circular. ※③ Opening, cutting, or tampering with the wiring on the uncut side will cause a disconnection.