‧ 8-band-per-ear algorithm to tailor to each individual’s unique hearing ‧ Eliminates annoying whistling feedback sound ‧ Reduces background noise ‧ Bluetooth connectivity for making and receiving calls, listening to music and watching videos ‧ Simple volume control with volume digitalization ‧ Instant DIY hearing test available at Heari Audio App for real-time hearing conditions ‧ USB chargeable battery with 10-hour battery life after fully charged ‧ Each in-ear earplug weighs 2grams only ‧ Remarkable durability of Aramid Fiber for wire connecting earbuds and neckband part ‧ Waterproof nano-coating cover protection