Design and features:The WI-SP500 has an integrated microphone and volume, music player, and call connect/disconnect controls for paired Bluetooth devices. Additional features include NFC Bluetooth pairing and support for Apple Siri and Google Assistant digital voice assistants when it is used with Bluetooth devices that have those capabilities. This model is claimed by the manufacturer to be water resistant and comes with two pairs of ear pieces in various sizes and a USB charging cable.
Sound quality: We found the WI-SP500 delivers sound quality that falls in the Good range - it reproduces music and voice reasonably well despite the obvious shortcomings in its sound. The overall sound can best be summarized as somewhat lean and grainy. Bass (as in bass drums, bass guitars, stand-up bass, etc.) has good detail and decent impact, but doesn't go deep. The midrange (voices, guitars, horns, etc.) is a somewhat thin and grainy, and a bit hazy and etched (a bit more sharply outlined then it should be). The treble (cymbals, the upper range of violins, etc.) is extended, but somewhat prominent and sizzly (sounds that should have a delicate shimmer have a sound reminiscent of bacon frying). The sound has a good sense of liveliness and is somewhat open -- sound-wise it almost seems like you don't have anything plugging up your ears.
Comfort: We found that these earphones stay in place even with vigorous head movement, but users may have to fiddle with them a bit to find the position that provides the best sound quality. The sound of the earphone connecting cable rubbing on clothing may be transmitted by the earphones.
