Can't get my controller to connect to my PS3?

I'm using a Afterglow wireless PS3 controller, when I turn it on the 4 red lights start flashing. My PS3 says "Connect the controller using a USB cable, then press the PS button" though there is no USB port on the controller. It is powered by 2 AA batteries the battery cover has a hole in it like its meant to have  rechargeable battery pack.

Update:

Also when the controller isn't on the red light on the USB dongle flashes, then turns solid when the controller turns on, then the controllers light flash

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