My Macbook Air cannot connect to DKnight bluetooth speaker

I have Macbook Air 10.10.4 and used to be able to pair it with Knight bluetooth speaker. I would use the speaker with my iPhone and with my iPad. Recently, the speaker paired only with my iPhone or my iPad.

To solve the problem, i turned off bluetooth on my iphopne and my iPad. I still could not connect the speaker to my laptop. I tried turning both devices off. Still no result. In each case, i would turn on and off the speaker.

I tried turning off and on blue tooth on my laptop too, and that did not help.

Any suggestions?