Ubon BT-5660 Bluetooth headphones are very very awesome headphones. I booked the headphones on 09 June and on 15 June I got my headphones. Firstly when I open it had the beautiful headphones on the front side. On back side there was a small box inside there was a data cable and a user manual was being kept with the headphones. When I turned on the Bluetooth mode in headphones and connected to my mobile, it got connected within 10 seconds. Even when I connected it back after sometimes it connected within 5 sec which is very interesting part I have ever saw in other Bluetooth headphones. First when I connected it the battery was full and I used it for around 7 hours non stop. Simply I can say that battery backup is fantastic. I m very happy with battery of the headphones. Again there is a memory card slot in it and we can connect AUX cable when there is no charge in the battery we can use AUX connection. But ubon company didn't provided any AUX cable. I strongly recommend everyone to buy this headphones because it is cost worth. The bass quality is also fabulous. We can change the equalizer also. For changing that they provided a button which can be used to change equalizer and to receive calls. The button can also used for FM radio functioning. So I highly recommend everybody
