This alarm presentation set contains two remote alarms and a wireless bite alarm receiver, plus two bright purple bite indicators. The KBI alarms are compact, rugged and reliable. Featuring a sensitive roller wheel and a bright LED, its a fantastic choice for all forms of specimen angling. The speaker features adjustable volume, while the LED boasts a 10 second alert feature. The receiver boasts a long wireless range, on/off switch and volume control. When used in conjunction with the alarm heads, its a top-quality combination thats not going to let you down.