The interior is beautifully done, with matte silver accents, five large, retro-styled vents, and a concise instrument panel.

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SpareOnePlus now comes in Flat Black and Matte Silver, both with a red battery screen, giving the product a premium look and feel.

ENGADGET: SpareOnePlus adds location tracking, audio alerts, keeps the 15-year life on a single AA battery eyes-on

Modern music enthusiasts can further customize their M-100 with the Matte Black Metal, Shadow or White Silver colors and a selection of shield colors which can be customized through V-MODA's laser engraving service with virtually any logo, text or a variety of select designs.

ENGADGET: V-Moda ships its listener-influenced Crossfade M-100 headphones