3.5mm jack socket to 2.5mm jack plug. Connect standard headphones to mini jack socket.
eBay
1/2pcs 90 Degree 5.5*2.1 Mm Male Jack To 5.5*2.1Mm Dc Power Adapter Connector Plug Conversion Head Jack Female Socket
Aliexpress UK
Adopt premium plastic and copper material. It ismade of high-class material, which enjoys strong durability.5mm microphone adapter cable, you should take at this item.5mmto 3. If you are looking for professional 2.
eBay
1/4 Inch Male To 3 Pin XLR Female Adapter Stereo 6.35 Mm Female To3-Pin XLR Male Mixer Juitar Microphone Connector 6.5-XLR Plug
Aliexpress UK
Geekria Apollo 4.4mm Male to 3.5mm Female and 4.4mm Male to 2.5mm Female Balanced Gold-Plated Adapter Compatible with Sony NW-ZX300A, NW-WM1A, NW-WM1Z, PHA-2A, TA-ZH1ES Audio Player, DAP ( 2 PCS). Connector: 4.4mm 5-Pole Male, 4-Pole 3.5mm and 2.5mm balanced Female.
eBay
Audio Cable 4.4mm Female to 2.5 mm Jack Balanced Adapter Male Conversion Cable Earphone Balanced StereoFor Hifi MP3 Music Player
Aliexpress UK
Headphone audio converter 2.5mm female to 3.5mm male. 1 Headphone Converter. Female connector: 2.5mm. Male plug: 3.5mm. Due to different lighting in the photos and differences in monitors, the pictures may not reflect the actual colour of the object.
eBay
YuXi 1/4" Mono / Stereo Audio Jack Plug Adapter 6.35 mm Male to 2x 6.35mm 3.5mm Female Headphone Microphone Splitter Converter
Aliexpress UK
Charging cable 1pcs. Material: Copper clad steel wire. Weight: 15g. Color: Black.
eBay
DC 5.5*2.1 mm Female 1 to 1 2 3 4 12V 4Pin PWM Fan Adapter Power Supply Connector Cable
Aliexpress UK
2.5mm Mini STEREO Jack Socket to 3.5mm STEREO Aux Jack Plug. 2.5mm Jack Socket to 3.5mm Jack Plug. High Quality Adapter.
eBay
1P DC 7.4 x 5.0 mm 7.4*0.6 female to 7.4*5.0 4.5*0.6 4.8*1.7mm 5.5*2.1/5.5x2.1mm male jack for HP DELL laptop power adapter plug
Aliexpress UK
Audio Adaptor - 2.5 mm stereo plug to 3.5 mm stereo jack socket.
eBay
Hifi 4.4mm to 3.5mm Audio cable Pure silver plated 4.4mm Balance to 3.5 mm aux jack Balanced Audio Adapter Cable Male to Male
Aliexpress UK
USB Male to 2.5mm 3.5mm 5.5mm DC Power Charger Plug Adapter Cable Lead 0.6A - 3A Product Information Product Name: DC Power Charger Plug Adapter Cable Lead Current: 0.6A-3A Specification: 2.5mm 3.5mm 5.5mm Length: 50cm-100cm Color: Black, White Origin: China Product Features The product is made of high-quality materials, and the thread body is made of environmentally friendly PV material. The soft and durable joint reinforcement fish tail design is resistant to bending and does not break.
eBay
UGREEN USB C to 3.5mm Audio Aux Cable Type C 3.5 mm Headphone Male Jack Plug Adapter
Aliexpress UK