Sony MZ-E520 MiniDisc Player

Sony MZ-E520 MiniDisc player (silver, blue). Quantity 1. Used.
* Player only. No other items, batteries, or accessories are included in the sale *
** This sale does not include any way of powering the device. Unless otherwise stated, this device requires a special kind of rechargeable 'gumstick' battery that is inserted into the device. Please either ensure you are familiar with this requirement in advance, or reach out to us if you are unsure. **

Summary:
Sold for Parts Only / Not Working.
The spring mechanism in the OPEN switch is broken and the lid can be opened unintentionally as the switch does not automatically pull back into the closed position.
You can manually slide the OPEN switch back into the closed position, but without something to hold it in place, it's easy for the switch to move back into the open position.
Apart from that, the device is functional and cosmetic condition is almost perfect.

Product Condition (Appearance):
Front Face : No callouts.
Sides : No callouts.
Rear Face : No callouts.
Internal Battery Compartment : Some corrosion on the battery terminal inside the lid.
No dents or signs of crushing.
All external facing screws present and tightened.

Product Condition (Functionality):
The spring mechanism in the OPEN switch is broken and the lid can be opened unintentionally as the switch does not automatically pull back into the closed position.
You can manually slide the OPEN switch back into the closed position, but without something to hold it in place, it's easy for the switch to move back into the open position.
Apart from that, the device is functional.
See test results and photographs for detail.

Player / Recorder Unit:
Sony MZ-E520

Power Via Rechargeable Gumstick Battery : OK *** Rechargeable gumstick battery is not included in the sale ***
Power Via External AA Battery Case : OK *** External AA battery case is not included in the sale ***
Power Via Battery Charging Stand (BCA-MZE520) : Not Tested *** Battery charging stand is not included in the sale ***

Audio Playback : OK - Listened to over an hour of audio with no issues
Audio Output : OK

Group : OK
Volume Down : OK
Volume Up : OK
Play / Pause : OK
Next Track : OK
Previous Track : OK
Stop : OK
Hold : OK

Disk Insert : OK
Disk Eject : OK

Device Setting Details:
AVLS set to OFF
Beep set to ON
Backlight set to AUTO
Power Mode set to NORMAL

Product Information:
The Sony MZ-E520 is the final iteration of the 5xx series of MiniDisc players (500,501,505,510,and 520). It is dedicated to disc playback, and does not have disc recording functionality. 
Released in 2004, it incorporates MDLP, anti-shock 'G Protection',a digital amplifier, a six band equalizer, and ATRAC type S technology. 
It weighs 70 grams without a battery or disc installed. 
It has a 3.5 mm headphone jack for audio output.

Hopefully this information is clear and covers everything you need, but don't hesitate to reach out if you have any questions.