The Microbeacon is a lightweight (1 oz with battery) small (fits in BT-20) device to help you find your rocket after it lands. Snap in the battery, and put a wrap of tape around it to secure it. Loop the Kevlar® lanyard through your nose cone eye screw, or tie it to your shock cord, and tuck the MicroBeacon into your rocket on top of the chute. The MicroBeacon is not loud; if it were, it would have to be bigger and heavier. However, because of the warbling tone it generates, it's easy to hear under most conditions. A fresh battery should power the Microbeacon for at least 48 hours; we've had reports of them working for three days. (24 hours of testing was all we could stand.)