Our dog training collar system is equipped with a high-sensitive receiver that covers a vast area of up to 1.2 acres (53189 square feet) when used with the transmitter and boundary wire (both not included). It offers two effective training modes: beep and shock, with multiple intensity levels (4 for each). As your dog approaches the boundary wire, the system sends a warning beep and, if they continue to cross, delivers an increasingly intense shock to train them to stay within the designated area. The collar strap is made of durable TPU material and is 28.3 inches long with 34 adjustable holes to ensure a comfortable fit for dogs of all sizes. It's IPX7 waterproof, constructed from robust ABS material, and can withstand wet conditions and rainy weather, providing a long service life. The receiver features a rechargeable 300mAh built-in battery, providing up to 2 days of standby time after a 2-4 hour charge. The indicator light turns red when it's working normally, flashes every 1-2 seconds. If the indicator flashes rapidly, it indicates low battery and needs recharging. While charging, the indicator remains steady on red and turns green when fully charged. This training collar system is a convenient and effective tool to train and contain your dog. Please note that the transmitter and boundary wire are not included.