Radians Vertex Electronic Ear Buds 21 dB In The Ear Black/Gray. Ambient sound can be amplified up to 5X while harmful noise can be compressed at your choice of two decibel levels. Soft rubber tips offer a comfortable fit and a reflective woven cable allows for hanging of the earpods around neck for security. A Lithium ion battery is incorporated for rechargeability. Specifications for Radians Vertex Corded Bluetooth 21dB In-Ear Hearing Protection: Manufacturer: Radians Color: Black/Gray Battery Type: Lithium-ion Rechargeable Features of Radians Vertex Corded Bluetooth 21dB In-Ear Hearing Protection 21dB NRR for in-ear hearing protection High/Low compression modes: 85dB & 105dB 5X enhancement of everyday sounds Bluetooth 5.0 connectivity for answering calls playing media 9 hours of run time with rechargeable lithium-ion batteries (USB-C cable included) 9mm dynamic range speakers Two omni-directional in-ear microphones Three rubber ear tip sizes for best fit Reflective woven cable Package Contents: Radians Vertex Corded Bluetooth 21dB In-Ear Hearing Protection Carrying case Radians VXBTAC10 Vertex Electronic Ear Buds 85 DB In The Ear Black/Gray VX-BTAC10