ifi Audio GO Blue Air; Hi-res USB DAC + headphone amp; Headphone connection: 3.5 mm stereo jack and 4.4 mm balanced jack; Output impedance: <1 Ohms; Bluetooth version 5.2; Bluetooth codecs: LDAC, LHDC/HWA, aptX Adaptive, aptX HD, aptX, AAC, SBC; Bluetooth chip: Qualcomm QCC5144; built-in MEMS microphone with noise and echo cancellation; Battery life: up to 10 hours; Power: 165 mW / 2.3 V @ 32 ohms, 14 mW / 2.9 V @ 600 ohms; Power (balanced): 262 mW / 2.9 V @ 32 ohms, 52 mW / 5.6 V @ 600 ohms; 2 analogue modes: XSpace (immerse yourself in concert-like sound), XBass (bass boost for recordings or headphones with weak bass); with magnetic clip for easy attachment; content of delivery: GO Blue Air, USB-A to USB-C adapter, microfibre protective bag, instructions; Weight: 31g