This is a YAMAHA TRBX305 I bought two years ago. I played it 4 or 5 times and then gave up, haven't touched it since. Soon after I started playing, I lost the battery compartment cover on the back of the bass, but the batteries fit snugly, so it wasn't a problem. Also, the amplifier cord is a compatible power supply for the YAMAHA THR5 and THR10. If you'd like, I'll also include a bass strap and a cable.