The FiiO BTR7 offers two uses at once. You can use it as a Bluetooth amplifier and upgrade your wired headphones to wireless headphones. Simply plug your headphones or earphones into the FiiO BTR7 and pair it via Bluetooth with your iPhone, iPad, Android smartphone, tablet or notebook to enjoy your music in superb, lossless quality and full bandwidth. Alternatively, use the BTR7 wired via its USB-C port as a premium USB DAC for a clearly audible sound enhancement for your smartphone, tablet or notebook (USB cable included for Apple iOS, Android and computer). Two integrated ES9219C DAC chips provide superb detailed sound reproduction. The THX amplifier design ensures a particularly pure sound image - noise floor and distortion are reduced to an absolute minimum. The high output power of 160 mW via the 3.5 mm headphone output and 320 mW via the balanced 4.4 mm headphone output ensure a voluminous energetic sound regardless of whether you use in-ear earphones or over-ear headphones. Functions such as skipping tracks, adjusting volume, play/pause, and answering/ending calls can be controlled directly from the BTR7's buttons. All the information you need is clearly visible on the BTR7's color display. The integrated battery provides up to 9 hours of battery life and can be quickly recharged within 1.5 hours. Wireless charging is supported by the BTR7. When connected to a smartphone via cable, the BTR7 draws the power it needs from its internal battery and does not discharge the smartphone's battery. Included in delivery are a noble leatherette case as well as a Lightning, a USB-C and a USB-A cable to connect Apple iPhone/iPad, Android devices and computers with the BTR7.