3 with Bluetooth transmitters APTX different brands, I can tell you that this one is the best by far. The sound quality is outstanding, the scope is 8 ~ 10 m depending on the obstacles. the equipment with my Beats Wireless headphones is fully automatic, no need to do anything to connect it to the PC every day, or even a click on the computer. Bluetooth resignation latency is quite satisfactory, finally able to watch videos without too much notice of image / sound lag. there is one, but not annoying milliseconds, unlike 1 2s for other models I have a horror. Responds perfectly to the helmet controls, exchange music tracks instantly. the also no latency! The stability output audio within 10m is also remarkable, no mute or distortion. Although it is one of the most expensive. but when we thought about it though, it's not worth saving 20 for a low-end model, to drip in listening to music and buy this model thereafter.
