RidgeLine’s Pro-Tekt Industrial Line protects users from dangerous noise levels while still allowing full awareness of surroundings. Dynamic Level Sound Compression (DLSC™) protects hearing without shutting off amplification system. Pro-Tekt Dimension 2™ series enables full transceiver communication, adapting directly or through Com-Control/Push To Talk units; connection to most commercial two-way radios. RidgeLine, Inc., Westcliffe, CO. www.Pro-Ears.com