6.3 mm. Jack adapter (2 x 3.5 mm female - 1 x 6.3 mm male)
DC female male jack plug 5.5X 2.1mm 2.5mm 6.5mm 3.5mm adapter Connector laptop | eBay
Goobay 3.5 mm / 2x RCA Audio Cable Adapter
USB-C® to AUX (3.5mm) Adapter Converter | USB-C Adapter Converters | USB-C Cables, Adapters, and Hubs | USB and PC
Audio adapter cable 2 x RCA (male) - 3.5 mm (female) - Biltema.dk
Use iPhone Earphones with 3-Conductor Stereo Devices
1x Gold Plated 3.5mm Trs Stereo Female 3 Pole Jack To 3x 1/8" 3 Pole Male Plug Audio Headphone Adapter Splitter Cable 30cm/1ft - Audio & Video Cables - AliExpress
Amazon.com: 2.5mm (Male) to 3.5mm (Female) headphone dapter (Converts your 3.5mm earphone jack into 2.5mm earphone jack) : Electronics
Apple Lightning to 3.5mm Adapter in the Adapters & Splitters department at Lowes.com
C2G USB C to Aux(3.5mm) Audio Adapter headphone | Lenovo US
Belkin Lightning Adapter Music 3.5 mm And Charge White | Techinn
3.5mm Female Jack to 2 RCA Plugs Audio Stereo Adapter - 6 inch