Features: Sound management technology protects and amplifies sounds based on the situation Two microphones per earbud improve sound clarity, so you know where noises come from Dynamic speakers deliver enhanced audio output Split-second SAC (Sound Activated Compression) safeguards hearing from loud noises A 25 dB NRR provides a high level of hearing protection in a compact, comfortable design Three sizes of locking fins, silicone foam tips, and silicone in-ear tips for exceptional comfort The USB charging case keeps lithium-ion batteries operational Earbuds deliver up to 9 hours of runtime, recharging in two hours The storage case provides as many as three charges on a full case for up to 36 hours of use A soft-touch control surface ensures simple, intuitive operation Included USB-C charging cable Auto shutoff IP54 water- and dust-resistant rating