NEW PrymeMAX™ professional grade, wireless dual-muff headsets with noise-cancelling boom mic and padded speaker are compatible with cellphones or tablets (iOS and Android) and can be dual-linked with two-way radios at the same time. Available in three mounting configurations: BTH-800 over-the-head style with wide padded band; BTH-900 Racing style has both over-the-head adjustable strap and behind-the-head spring steel band for secure fit; BTH-700 kit fits most safety helmets used in construction.