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Vertical Breadboard-Friendly 3.5mm Mono Headphone Jack : ID 4031 : $1.25 : Adafruit Industries, Unique & fun DIY electronics and kits
3.5 mm Male to Male Stereo Breakout Cable - 1010music LLC
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Audio Cable Double 6.35mm Male Mono Jack to Stereo 3.5mm Jack Aux Cord 3.5mm to Dual 6.5mm Adapter Jack Wirefor iPad Laptop|audio cable|jack auxjack to jack - AliExpress
6" 3.5mm Stereo female to Dual 3.5mm Mono Male Left/Right Adapter Cable, AV-Y16 | eBay
Metal Adapter Plug 2 Mono Male 6.3mm To Female 3.5mm Audio Adapter Plug 6.35mm Mono Angle Audio Cable - Plug & Connectors - AliExpress
3.5mm Stereo Male to 3.5mm Mono Female Adapter (TAA Compliant) | Audio Adapters and Couplers | Adapters and Couplers | Audio Video
6ft (1.8m) Velocity™ 3.5mm M/M Mono Audio Cable | Audio Cables | AV Cables | Audio Video
3.5mm Mono Plug to 3.5mm Mono Jack Adapter
1m 3.5mm Stereo Plug to 2x Mono Jack Adapter Cable AUX Audio Line Splitter Lead 5055538150425 | eBay
3.5mm Mono Cable (3FT) - 12V Trigger, IR Infrared Sensor Receiver Extension Extender, 3.5mm 1/8" TS Monaural Mini Mono Audio Plug Jack Connector Male to Male Cable Wire Cord - Walmart.com
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1x 3.5mm Female Stereo to 2.5mm Male Mono Headphones Aux Adapter Converter Cable | eBay
3.5mm Mono Audio Jack to Alligator Clip Cable : ID 4182 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits