Highlights Keep your pet in a safe and secure area by creating a circular boundary around a transmitter using radio waves instead of a physical fence The transmitter emits a harmless radio signal in a radius around itself and the signal is detected by the collar. Customize the 4-level adjustable radius of the boundary from 131ft to 722ft With an adjustable neck circumference of 5.5-23.6in, it's suitable for small, medium, and large dogs weighing 4lbs+ Work for 10 days Details *Features*: *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. *Specifications*: 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: 15*12*5.5cm/5.9*4.7*2.2in Package Weight 142g/0.3lbs *Package Lists*: 1 x Receiver 1 x USB Cable 1 x Collar 4 x Metal Probes 4 x Conductive Silicone Jackets