Our electronic fencing system creates an effective signal field to deter our dogs from the designated area, which greatly ensures our pets3afety. The transmitter features multiple dogs support, 0.75 acre signal field range and 100 adjustable levels. Once you start up the system, the receiver will automatically send beep(4 levels) and shock(4 levels) as your dog try to cross the boundary wire. The rechargeable feature, IPX7 waterproof performance and adjustable collar strap provide much convenience during use.