Acousti-corder 900, cassette recorder, mic

Good condition, tested.
The item is an Acousti-corder 900, a vintage cassette tape recorder from the 1970s. It is a portable device used for playing and recording audio on cassette tapes. 
Functionality:
It features buttons for recording (REC), rewinding (REW), fast-forwarding (FF), playing (PLAY), stopping (STOP), and ejecting tapes (EJECT). 
Portability:
Designed to be easily carried, it includes a handle and can operate on batteries or AC power. 
Recording:
It can record audio from a built-in microphone or an external source via a jack. 
Sound Quality:
As an analog device, the sound quality may have some background noise or "hiss". 
Collectibility:
Due to its vintage nature, it may be of interest to collectors of retro audio equipment. 
Operation:
Cassette tape recorders use magnetic tape to record and play sound.