Yamaha's THR series is awesome. This one is the high-gain, battery powered example, and it sounds awesome. It's remarkably loud and has heaps of bass response. I rate these above the equivalent Roland gear, but hey, what do I know?

Model: Yamaha THR10X
Made: China, recent model (serial T197645VX)
Output: 10 watts
Power: 15v AC via included adaptor or 8xAA batteries
Speaker: 2 x 3.15" speakers 
Channels: 1, switchable to several amp modes
Finish: olive
Accessories: power supply only

Condition notes: Used, no major marks, fully functional. Overall: very good condition.