makes this rugged, top quality microphone and it works for 5-pin radios, Telex includes a card with wiring guide for Ranger, HR2510, Midland, Radio Shack/Sears, and Cobra/Uniden radios, Noise Canceling, Excellent voice characteristics, Dynamic, Coil is six-wire, RK56B comes with 5-pin end, Push-to-Talk button located on Right side of mic, Correction: This is a 4-pin mic, SKU: CBDST3474