This dog training collar receiver is designed as a replacement or additional unit for multi-dog households. It features three safe and effective training modes including sound, vibration, and static shock, each with six adjustable intensity levels to help correct unwanted behaviors. The receiver supports signal reception up to 984 feet, making it suitable for training in yards, parks, and other outdoor spaces. The adjustable collar strap fits dogs of nearly all sizes with a circumference range of 8.66 to 20.87 inches, and includes four metal contact probes for secure fitting. Built with IP65 waterproof protection, the receiver can withstand rainy conditions and outdoor water play. The rechargeable 400mAh lithium battery provides up to 30 days of standby time and recharges fully in 2 to 3 hours. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.