Tiny Deal offers the Xiaomi Piston 3 In-Ear Headphones in Titanium Star, bundled with the Smart Klick Key for $22.09. Coupon code "MIERP1" cuts the price to $20.03. With free shipping, that's $10 under the lowest total price we could find for these items purchased seperately elsewhere. The Smart Klick Key can be programmed as a shortcut for taking pictures, recording, or opening an app. The headphones feature a frequency response of 20Hz-20,000KHz, and a gold plated 3.5mm plus. They work with most Apple and Android smartphones.