In accordance with established protocol, I hereby present an assessment of the Yamaha PS 20, a model that has garnered recognition due to its association with Beach House. It is imperative to note that this synthesizer has undergone comprehensive testing, with results indicating its functional viability. While there are minor blemishes in the form of superficial scratches, the unit, by and large, maintains an admirable standard of cosmetic integrity. Importantly, there is no structural damage to the plastic housing.

To elucidate further, the operational aspects of this device are deemed satisfactory, encompassing functionality across various sections, including the orchestra, drum rhythms, bass arpeggio, and the integral speaker system. It is, however, incumbent upon me to report that the initial key of the keyboard exhibits non-functionality. Conversely, the remaining keys remain operational, albeit with a potential improvement achievable through a thorough cleaning regimen.

Should any inquiries arise pertaining to the specifications of this instrument, the following details are presented for your reference:

- Year of Manufacture: 1981

- Keyboard Configuration: Comprising 49 keys

- Polyphony Capability: Accommodating up to 10 simultaneous notes

- Pre-installed Sound Library (ROM): Comprising 10 distinct sounds and 8 rhythmic patterns

- Specialized Sustain Effect: Included

- Power Consumption Rating: 15 watts

- Dimensions: Measuring 840 mm x 290 mm x 90 mm

- Weight: Registered at 6.1 kilograms

- Notably, this keyboard incorporates an integrated 5-watt monophonic speaker system.

Please be encouraged to submit any queries or concerns for further clarification or assistance.

(Thanks to ChatGPT for helping me here :) )