No batteries required,Unit comes with a rechargeable receiver collar via USB Cable

Model:W-227B This hidden W-227B fencing system is among the most reliable,cost-efficient let containment systems available today.

How it works: A buried wire transmits a harmless radio signal. When you dog approaches the boundary, the signal causes the dog’s collar receiver to deliver a warning beep first. If your dog continues closer to the boundary, the system will issue a mild shock. If your dog continues further, the system will issue stronger shocks until your dog returns to within the boundary your have set up. Your dog will naturally seek to avoid correction, and is content staying within established boundaries.

Main Features: -Waterproof Rechargeable Collar via usb cable -Total Length of Wire: 300 Meters

-Progressive Tone Stimulus:A warning tone will be issued first then a shock stimulus if your dog continues to move closer to the boundary

-Pulsed Proportional Stimulus:The closer your dog gets to the boundary ,the more intense the shock will be.

-Speed Detect Anti-Run Through:The faster your dog is moving,the quicker the high level of intensity will be issued.

-Audible/Visual Wire Break Alarm:Should your buried wire ever break a loud sonic alarm will sound accompanied by a flashing light. -Variable Field Width Control:Allows you to precisely control the width of the signal field.

-Multiple Collar operation:Add as many collars as you like

-Up to 5000 square meters range(per 1.2 acre)

Package includes:

• 1 x Indoor wall-mounted transmitter
• 1 x AC 110~240v power adapter plug)
• 2 x Adjustable receiver collar(waterproof Rechargeable)
• 1x USB Cable
• 1 x Boundary wire of 300 meters
• 2 x extra metal contact points -20 Training flags -1 x test bulb
• 4 x Screws
• 1 x English user manual