T20 with 5654W Tube: CSR64215 wireless Bluetooth 4.2 core support aptX low latency, Streaming range up to 39ft (12m), With Bluetooth and AUX selector, no pop when Bluetooth connecting. >T20 with 5654W Tube:50W RMS x2 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. >T20 with 5654W Tube:Adopt 2 x 5654W tubes to get clear audio sound, tubes can be replaced by 6K4, 6J1, 6AK5, 6?1?, 6BC5, 403A/B, EF40, EF95 and so on, with headphone output for 16-64ohm headphones.
>Bluetooth
Antenna: ?Specifications?SMA-J [[[[[[MALE PLUG]]]]]], length: 195mm, 90 degree tilt and 360 degree swivel on antennas>Bluetooth
Antenna: ?Compatible?Works with 2.4GH z wireless systems and Bluetooth signals which have female SMA-K connector