Communication Headset, Headset Style Hard Hat-Mounted, Noise Reduction Rating 25 dB, Dielectric No, Intrinsically Safe No, Connection Type Headset to Headset and Bluetooth, Cushion Material Foam, PVC, Cup Color Blue, Two-Way Radio Communication Type Listen, Talk, Auxiliary Input Bluetooth, Compatible with Series Slotted Front-Brim Hard Hats, Standards ANSI S 3.19 -1974, Band Color Blue, Band Material Stainless Steel, Battery Chemistry Li-Ion, Battery Life 11 hr, Battery Size 3.7V