Special Features:

Weight is 4.2 ounces, length is 3.5 inches, height is 2.O inches, and depth is 1.75 inches; automatic shutdown; flashing led when only 10 percent of battery life remains; rebbed and textured surfaces; large surface thumb latch; radel plastic construction; bayonet mount; gaskets surrounding bayonet mount; directional speaker

Properties:

An electronic device whose audio frequency input signals control power from a source independant of the input signal and delivers audio frequency output signals of greater amplitude with respect to current and/or voltage. The output signals characteristics are uniformly related to the input signals. It operates at frequencies of 20 kilohertzs and below. It may or may not have signal switching capabilities.