Useless for me since it doesn't mention which models it is compatible with so that I can get the appropriate sound system. It doesn't work with what I have

Very good for their price, they work with Bluetooth, charge with USB, and their battery lasts a long time.

Very easy installation even with very basic knowledge. There is a slight delay from the time you press the button until the command is executed, about half a second or maybe less, but it is logical since it works with Bluetooth. In addition to the controllers, charger, and Bluetooth adapter, it has 2 silicone cases and double-sided tape for their placement. Time will tell, but for now, a) both work perfectly and b) I haven't charged them yet except for the first day. Finally, they have a backlight illumination of approximately 2 seconds in blue color.