This is an early model Small Stone from Electro-Harmonix, from the wooden box era. It's known for its unique sound, combining both smoothness and intensity. Currently, it outputs sound, and the battery cover condition can be seen in the images (the cover is present, but the fixing screw is missing). Also, the power jack has been replaced, so please take note of that as well. Considering the above, this item is being sold as junk. Thank you. - Model Name: EH4800 - Brand: Electro-Harmonix - Type: Phaser - Country of Manufacture: USA - Connections: INPUT/OUTPUT/9V Thank you for looking.