BEFORE PLACING YOUR ORDER CONTACT US SO WE CAN CONFIRM AVAILABILITY AND OFFER YOU A DISCOUNT CODE. YOU MAY DO THIS VIA CHAT OR EMAIL [email protected] SEND US THE PRODUCT NAME AND WE WILL PROVIDE THE DISCOUNT CODE. WE PREFER CHAT TO GET RESPONSE.Our pet training collar receiver is compatible with our GPCT4253 dog fencing system. Once the system is been started up and the signal is detected by the receiver, the receiver will automatically send beep(4 levels) and shock(4 levels) as your dog try to cross the boundary wire. The closer your dog goes, the more intense the shock will be, effectively train him back to the play area you set. Keeps standby for around 2 days after fully charged for 2-4 hours. The IPX7 waterproof performance allows your dog to play in wet grass or rainy weather. The adjustable collar strap with 34 holes can be adjusted to fit your dog’s neck properly. Fit for dog of all sizes. (Only Receiver, Fencing System Not Included)