Main Features: -QCC3031 wireless Bluetooth 5.0 core support aptX, streaming range up to 39ft(12m), with Bluetooth and AUX selector, no pop when Bluetooth connecting.  -50W RMS X 2 power output(4 ohms, 20 Hz - 20 kHz, 0.04% THD), built-in speakers protection circuit, best for outdoor/ bookshelf/ computer/ desktop /ceiling /floor standing speakers, can use iPod, Phone, MP3 players, TV, Echo Dot, CD players, or Streaming Media players as input.  -Adopt 2 x 6J4 tubes to get clear audio sound, tubes can be replaced by 6K4, 6J1, GE5654, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95 and so on, with headphone output for 16-64ohm headphones.  -Small simple compact design but practical and powerful, Hi-Fi Bluetooth amplifier receiver exclusively designed for the customers who pursue HiFi sound.  -Power amp + Headphone amp, perfectly suited for your desktop or a smaller space in your home or office, digital amplifier is easy to connect to your audio system with no software to install or settings to change.     Specification:  Input Range:12-24V;  Voltage:AC 100-240V;  Headphones Output:16-64Ohm;  Terminating Impedance:2 Ohm-8 Ohm;  MAX Power Output:50W x 2;  THD:≤ 0.04%;  SNR:≥ 99dB;  Amplifier Chip:TPA3116;  Input Sensitivity:≤ 280mV;  Frequency Range:20Hz-20kHz(±1dB);  Input Mode:Bluetooth/RCA;  Bluetooth Distance:12m(39Ft);  Bluetooth Version:QCC3031 Bluetooth 5.0 support apt-X;     Dimension: Product Weight:0.80kg;  Product Size (L x W x H): 9.82 x 12.85 x 3.30cm / 3.86 x 5.06 x 1.35 inches.     Package Contents: 1 x Amplifier, 1 x Power Cord, 2 x 6J4 Vacuum Tube,  1 x  Bluetooth Antenna, 1 x Manual, 1 x  EU Plug(We will send you an adapter which according to your country)