BLOCK NOISE: ANSI-certified 27 dB Noise Reduction Rating (NRR) ear plug headphones. OSHA Compliant.
ALL DAY BATTERY: 16 hour music playback time, 270 hour standby time. USB-rechargeable battery.
SAFEMAX TECHNOLOGY: 79 dB volume limiter to prevent hearing damage, even at maximum volume.

Contains bundle of WorkTunes Connect + AM/FM Hearing Protector with Bluetooth Technology & Hearing Protector Replacement Hygiene Kit
3M Worktunes: Noise Reduction Rating (NRR) of 24 dB
3M Worktunes: BLUETOOTH TECHNOLOGY lets you seamlessly stream entertainment from your mobile phone and any other Bluetooth enabled device

[Great Noise Reduction & Premium Sound] With an NRR of 30db, the Bluetooth earphones are equipped with noise protection earplugs and built-in noise canceling microphone, this blocks continuous noises like engines, drills, saws etc, so you can listen to music and talk on the phone without having to stop your work progress. With two 10mm speakers, the durable Bluetooth earbuds deliver trusted sound in a dynamic range while protecting your hearing.
[Ultra Long-Lasting Battery] With a super powerful rechargeable battery of 480mAh, the earphone provides up to 50+ Hours of continuous music or phone conversation with a single full charge. Meaning that the battery can last 6+ working days if working 8 hours a day. With 3pcs battery capacity indicator lights on the control panel, you can easily tell the real-time battery capacity and no need to worry about battery running out during the work shift.
[Customized & Secure Fit] Includes multiple interchangeable ear cushions (3 sizes each of foam ear tips and triple-flanged silicone ear tips), you can always find the best fit to your ears. With over-ear hook style, the memory wire cable goes over the top of the ear, allowing the buds to fit securely and comfortably in your ears while using them.