The T20 Wireless In-Ear Headphones from RHA deliver high-fidelity sound backed by DualCoil technology, which provides music with both power and depth that equally focuses on bass, mid, and treble frequencies. They pair with your device using Bluetooth 4.1, which has an operational range of 32.8', or take advantage of wired 3.5mm connectivity with the included OFC cable. The earpieces feature a frequency range of 16 Hz to 40 kHz, an impedance of 16 ohms, a sensitivity of 90 dB, and are rated for 2mW of power, but can deliver up to 5mW. Detachable stainless steel housings provide durability, and a universal remote and microphone are also integrated. Other features include a SecureFlex neckband and aptX codec support.