NEW PrymeMAX™ series Professional grade, wireless dual-muff headsets now are compatible with Cell Phones and tablets (iOS and Android), all PrymeBLU Radio adapters (including new V2 series), and ICOM/Kenwood/EFJ and BK radios that have bulit-in Bluetooth. Ear Muff headsets are vailable in three different mounting configurations. The BTH-800 Over-the-Head (OTH) style has a wide padded head band that is very comfortable. The BTH-900 Racing style has both an over-the-head adjustable strap and a strong Behind-the-Head (BTH) spring steel band for tight, secure fit. The BTH-700 kit is designed to fit in the slots found on most safety helmets used in safety/construction applications. ALL versions of the BTH-600/700/900 can be dual-linked with cellphone or tablets AND TWO-WAY RADIOS - AT THE SAME TIME!