I bought this about 3 months ago for around ¥4000. I've used it a few times. The condition is very good and clean, but I've thrown away the box and instructions. The battery is included, so you can use it right away. Product Details: [Latest Improved Model] Anti-Barking Device for Dogs, Dual Ultrasonic Sound Emitter & Smart Variable Frequency, 2-Stage Sensitivity Adjustment, Effective Range 15m, Small and Lightweight & USB Charging, Compatible with All Dog Breeds, Safe and Harmless, Indoor and Outdoor Use, Portable Light