Specifications: Noise: -80dB Frequency Response: 20Hz-20kHz ±0.5db THD : ≤0.03% @ 1KHz SNR: ≥82dB Max Input Level of Mic: 16dBu Max Input Level of Circuit: 30dBu Max Input Level of Stereo: 20dBu Headphone Output: 200Ω/300mW Other Output: +20dBu Item Size: 20 * 24.6 * 5.8cm / 7.87 * 9.69 * 2.28in Item Weight: 970g / 34.22oz Package Size: 31.5 * 24 * 8.5cm / 12.4 * 9.45 * 3.35in Package Weight: 1300g /49.38oz Features: RE4 mixer is a professional 4-channel mixing console, AUX auxiliary output，XLR output，Lotus stereo input，4 mono input channels, 48V phantom power supply switch 3.4 channels support 48V，USB input channel, with 6.5mm, XLR, RCA sockets for connecting various devices, such as condenser microphone, dynamic mic, wireless microphone, guitar, passive speaker etc. Suitable for recording studios, public address systems, bars, broadcasting, live streaming, television, and film post-production etc. supports high,mid, bass, reverb, input gain, volume adjustment, and real-time audio monitoring. Stereo balance adjustment Built-in reverberation delay effect（Delay、Repeat），Aux Output Connect the effector to enhance the reverberation effect Through wireless Bluetooth connection, tunes musics from iPad, iPhone and Android Smart Phone within 10 meters, fast and stable. It also supports USB/MP3 Play, Computer/U-Disk Record.MP3 part with independant volume control. Support both Power Bank supply and 110-220V universal voltage, Available in all countries