This wireless collar can receive the remote signal sent by the transmitter and will beep and emit safe static stimulation until the dog goes back into the signal boundary. Your dog will naturally seek to avoid correction, and is content staying within established boundaries. Keep safe in limited space. Automatic Dog Training: The transmitter emits a harmless radio signal in a radius around itself and the signal is detected by the collar. If your dog walks out of the signal boundary, the receiver will send sound warning first and then emit safe static stimulation until the dog goes back into the signal boundary. In this way, your pet will gradually recognize the existence of fence boundaries and learn to stop at the warning signal. Adjustable Boundary Range & Shock Level: You can customize the 4-level adjustable radius of the boundary from 131ft to 722ft, suitable for both indoor and outdoor usage. With 0-8 level adjustable shock intensity, you can adjust the stimulation level whenever needed. Adjustable Neck Circumference: With an adjustable neck circumference of 5.5in-23.6in, it’s suitable for small, medium, and large dogs weighing 4lbs . IP67 Waterproof Collar: The IP67 waterproof receiver can work normally when your dog swims or runs in the rain. Make sure that the charging port is well-sealed before the dog enters water. USB Rechargeable: This USB rechargeable collar can stand by for up to 10days after being fully charged for 4hrs. No need to recharge it frequently. Brand: Fresh Fab Finds Product Type: Dog Training Receiver Color: Black Material: ABS Remote Transmission Distance: 220m/722ft Adjustable Collar Circumference: 5.5in-23.6in Receiver Battery: 1*Built-in 3.7V 300mA Lithium Charging Time: 4Hrs Standby Time: 10Days Shock Intensity Level: 0-8 Adjustable Receiver Waterproof Rate: IP67 USB Cable Length: 83cm/32.7in Receiver Size: 6.5*3*4cm/2.6*1.2*1.57in Receiver Weight: 52g/0.11lbs Package Size: 9x8x4.5cm/3.54x3.15x1.77in Package Weight: 138g/0.3lbs 1 x Receiver 1 x USB Cable 1 x Collar 4 x Metal Probes 4 x Conductive Silicone Jackets