Please make sure your item is sold and shipped from Amazon.com. If you purchase from a 3rd party marketplace seller other than Amazon.com, you are not getting a true MaximalPower brand product, and your purchase is not covered by a . Fits two-way radios, radio speaker mics, MP3 players and similar devices with 3.5mm connector. Works with standard, Incom, Yaesu, Alinco, Motorola and Adi transceivers. Speaker diameter: 15mm, Output level: 72dB, Rated input power: 0.1W, Maximum input power: 0.2W, Output impedance: 32 ohms. 1 year limited .