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Amazon.com: 3.5mm Mono to Stereo Adapter, 2 Pack 3.5mm 1/8" Mono Male Plug to 3.5mm 1/8" TRS Stereo Female Jack for Radio, Headphone : Everything Else
6.35mm Stereo Plug to 6.35mm Mono Jack Adapter
Amazon.com: 1/8 Mono Jack to 1/4 Stereo Plug Headphone Adapter : Electronics
Y Adapter Mini Jack stereo to 2x 1/4 Jack mono (female)
Amazon.com: TISINO 1/8 to 1/4 Stereo Cable, 1/8 Inch TRS Stereo to Dual 1/4 inch TS Mono Y-Splitter Cable 3.5mm Aux Mini Jack to Jack Breakout Cord - 10 feet : Electronics
Mono-to-Stereo 3.5mm 2-Conductor to 3-Cond Adapter
Amazon.com: Monoprice 107129 3.5mm Stereo Plug to 3.5mm Mono Jack Adaptor, Gold Plated : Electronics
Amazon.com: JOMLEY 1/8 to 1/4 Stereo Cable, 1/8 Inch Stereo to Dual 1/4 Inch Mono Cable, 3.5mm to 1/4 Splitter Cable Mini Jack to Jack Stereo Breakout Cable - 3.3ft : Electronics
File:Jack mono jack stereo xlr male and female.JPG - Wikimedia Commons
3.5mm 2 3 4 Pole Mono Stereo Audio Connector Video plug headphone Cable Adapter | eBay
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Amazon.com: 3ft 1/4" TRS Stereo Male Plug to 2 1/4" Ts Mono Plug Cable : Everything Else
Klotz KYI-300 MiniLink Pro Insert Cable [Mono>Stereo] 3m | MUSIC STORE professional
Vanco International 3.5 mm Mono Plug - 1/4" Stereo Jack Adapter
Amazon.com: 3.5mm Stereo Male to Dual 3.5mm Mono Male Audio Cable, 1ft 3.5mm 1/8" TRS Male to 2 x 3.5mm 1/8" TS Male Y Breakout Cable Splitter Adapter for Headphone, Speaker :
3.5mm Mono Plug 2.5mm Jack Adapter | 2.5mm Stereo Plug 3.5mm Mono Jack - 4pcs 3.5mm - Aliexpress
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Stereo Jack - Mono Jack(x2) Cable, 1m at Gear4music