This is a complete Watkins/Hotspring Bluetooth receiver, integrated amplifier for 4 hot tub speakers and amplified 8” subwoofer. I am the original owner and tested the functionality in my personal spa. The system was removed as I have different speakers that I use. This is a Bluetooth receiver but also has inputs for a spa TV and other external sound sources. All wire harnesses and OEM UL listed power supply are included. Spa Bullet 8” subwoofer is model 76620 or 77165. Receiver / amp is model 77843 or 77133 rev E.
eBay