Sangean Portable Pillow Speaker for In-line Volume Control and Amplifier Use with any Radio, Radio Cassette, Clock Radio, CD Player or Other Equipment Fitted with a 3.5 mm Headphone Socket - Walmart.com
Vtg. Radio Shack 33-208 Pillow Speaker 1/8” Plug
Radio Shack Pillow Speaker Built-In Volume Control NEW # 33-208 Audio Accessory 40293124991 | eBay
UPC 040293162962 - Vintage Radio Shack Deluxe Pillow Speaker w/Volume Control 33-209 | upcitemdb.com