Supporting multiple inputs (RCA/AUX/USB/Bluetooth) and outputs (speaker/headphone), can as USB sound card supporting computers (no need for driver) and phones (with OTG function) input, almost can meet all kinds of home audio system device.
eBay
For Lighting Headphone Adapter for IPhone 11 12 13 14 Pro Max 12Mini SE 2020 XS XR X 8 7 + IOS To 3.5 Mm Jack AUX Audio Cable
Aliexpress UK
Adopting innovative circuit design, DC 5-20V wide input working voltage, the amplifier circuit can always work at a high voltage of 26V, and the background noise index is excellent. With wide frequency response extension, excellent transient response, excellent purity and transparency, and good dynamic range.
eBay
2 IN 1 OTG Elbow USB Type C to 3.5 mm AUX Jack Audio Headphone Adapter Splitter 60W Fast Charging for Samsung Xiaomi iPhone 15
Aliexpress UK
Outputs are 3.5mm or jacks. Size is 88mm(L) x 38mm(W) x 38.5mm(H). LOSSLESS SIGNAL AND INTERFERENCE RESISTANT: This is a stereo switch box with lossless signal, solid aluminum alloy shell with strong interference resistance.
eBay
VR robot Motorcycle Helmet Headset 3.5mm Jack Wired Earphones Music Headphones with Handsfree for Motorbike Rider
Aliexpress UK
【 High-Fidelity Sound Neoteck 16-150Ω Audio Headphone Amplifier Boasts a 3.5mm AUX Input and Output, with an SNR>120Db and THD+N of 0.0003%. which Allows it to Output not only Louder Sound but also a Sharper and More Realistic Stereo Sound without Distortion.
eBay
USB-C Wired Headphone 3.5mm 3 5 Jack Earbud HiFi in-Ear Headset For Samsung Galaxy S24 S23 S22 S21 Ultra A54 A53 Type C Earphone
Aliexpress UK
is built on the success of the earlier Hugo DAC/headphone amplifier.
eBay
UGREEN 3.5mm USB Type C Wired Earbuds with Microphone, Wired Earphones in Ear Headphones HiFi Stereo,For Most with 3.5mm Jack
Aliexpress UK
MM/MC phono preamp: converts phono signal to line level signal, low-noise integrated circuits and high-quality components are designed to ensure clear sound; with a MM/MC switch on the bottom, easy to select to match different kinds of turntables. LINE and 3.5mm headphone outputs: with stereo RCA output to connect amplifiers or active speakers, greatly improve their sound quality; also add a 3.5mm headphone jack to drive all 16-200Ω headphones, convenient to enjoy music from record players alone or at night.
eBay
UGREEN 3.5mm USB Type C Wired Earbuds with Microphone, Wired Earphones in Ear Headphones HiFi Stereo,For Most with 3.5mm Jack
Aliexpress UK
This professional headphone amplifier allows for a signal source to be connected both left and right via RCA connections (CD player or mixer), or connect with a 3.5mm stereo jack (computer sound card, mixer headphone output).
eBay
Lightning to 3.5mm Headphone Adapter 8pin To 3.5 mm Jack Charger Splitter Converter for IPhone 14 13 12 11
Aliexpress UK
A high quality, professional grade headphone amplifier with 4 outputs. All inputs and outputs are designed for stereo signals via ¼” TRS jacks. Furthermore there is enough signal-gain to use this amplifier with almost any headphone.
eBay
Toocki AUX Cable Speaker Cable 3.5mm Jack Male to Male Audio Cable For Car Headphone Adapter Xiaomi Samsung AUX Cord
Aliexpress UK