The Wolf X1 2 Rod Set & XR HUBB is a complete bite alarm system with 2 bite alarms and 1 receiver. It offers 5-year warranty, volume control, tone adjustment and mute setting. The waterproof speaker, stainless steel lock nut and long-lasting lithium battery ensure reliability. Features 5 sensitivity settings, high visibility LED illumination and low battery warning. The system has an extreme transmit/receive range and detects both forward and backward bites.