This is the "Twinkle Lead" (blue), a leash with a harness for extra-small dogs from Hotta Corporation. Color Name: Blue Neck: 28-39 cm Chest: 33-47 cm Key Features: Manufacturer: Hotta Corporation (HOTTA) Product Name: Twinkle Lead Target: Extra-small dogs (under 5kg, suitable for Chihuahuas, etc.) Functions: Reflective function that shines when illuminated by car lights, providing safety during nighttime walks. Soft-touch material that easily fits any type of dog. Integrated harness and leash type.