Earbuds, Noise Reduction Rating 22 dB, 25 dB, Earplug Shape Cylinder, Intrinsically Safe No, Dielectric No, Wired Connection Type Not Applicable, Connection Type Bluetooth, Earplug Color Black, Red, Earplug Size Multiple, Auxiliary Input Bluetooth, Series REDLITHIUM USB, Battery Chemistry Redlithium, Battery Life 70 hr, Battery Type Rechargeable, Button Functions Control Audio, Control Calls, Earplug Material Foam, Silicone