NW-S15K

The NW-S15K is a twelfth-generation S Series model with 16 GB storage, MP3/WMA/AAC/WAV support, 77-hour lithium-ion battery, Bluetooth, speaker output, video and photo playback, and Clear Phase. AptX was part of the generation's wireless update.

The speaker-equipped K version completed the capacity range of the twelfth-generation S line. It keeps that same S15 platform and extends it into the same accessory-driven logic as the surrounding variants.