Connector type male.
eBay
Fosi Audio Q4 Mini Stereo USB Gaming DAC & Headphone Amplifier Audio Converter Adapter for Home/Desktop Powered/Active Speakers
Aliexpress UK
Chassis or panel mounting, allows you connect devices such as amplifiers and AV receivers to MP3 Players or smartphones with 3.5mm male plug. Supplied with an attractive knurled fixing nut enabling the socket to be secured to a panel.
eBay
Woopker Mini Amplifier TPA3116 Bluetooth 5.0 Hifi Stereo Audio Receiver Power Amp 50W+50W Car Sound Amplifiers Digital Amplifier
Aliexpress UK
3.5mm Stereo 4 pole connector suitable for headphone inputs. 3.5mm mini jack chassis socket for mounting onto flat panel surfaces. 3.5mm Mini Stereo Jack Socket. 3.5mm Flat Panel Chassis Connector.
eBay
Mini Amplifier Bluetooth 5.0 Digital Audio Power Class D HiFi Stereo 200W*2 12V/24V Home Car USB Music Sound Card AMP Speaker
Aliexpress UK
2.5mm Stereo 3 pole connector suitable for headphone inputs. 2.5mm mini jack chassis socket for mounting onto flat panel surfaces. 2.5mm Mini Stereo Jack Socket. 2.5mm Flat Panel Chassis Connector.
eBay
ST-838 HiFi 2.1 Channel Power Amplifier Stereo Bass Sound Amp RMS 20Wx2+40W Class D Mini Media Player MP3 Car Black Home Amplify
Aliexpress UK
3.5mm Stereo 4 pole connector suitable for headphone inputs. 3.5mm mini jack chassis socket for mounting onto flat panel surfaces. 3.5mm Mini Stereo Jack Socket.
eBay
AK35/AK45 800W Home Power Amplifier 2 Channel Bluetooth 5.0 Mini Hifi Digital Stereo Sound Amplifier Support FM USB SD Mic input
Aliexpress UK
3.5mm Headphone Jack Solder Connector. 3.5mm Stereo 3 pole connector suitable for headphone inputs. 3.5mm Mini Stereo Jack Connector. 3.5mm mini jack connectors for soldering onto cables up to 5mm.
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Mini Touch Screen 4*25W Stereo Music Panel PA SystemBluetooth Wall Amplifier Smart Home Audio Ceiling Speaker Wall Amplifier
Aliexpress UK
Manufacturer Ugreen Group Limited. RCA to 3.5mm Audio Cable: UGREEN RCA to Aux Cable makes it easy to play music from devices of 3.5mm jack on old audio output devices of 2RCA(Red and White) ports, like Hi-Fi amplifier, speaker, turntable, DVD player, AV receiver.
eBay
Mini Stereo Mixer 4 in 1 Out Volume Adjustment 3.5mm Sound Selector Amplifier for PC Laptop Headphone Sound Mixer Selector
Aliexpress UK
1 Wired Lavalier Microphone. Effectively reduce current sound,filter noise, allow the invoice to be recorded clearly into the devices. 【Clip on Design, 1.5M Microphone】The lapel microphone is clip on design and you can attach it easily to your clothes,shirt, tie or pocket, make your hand free, convenient to use.
eBay
Nobsound HiFi Stereo Line Level Pre-Amplifier Mini Audio Signal Booster 20dB High-gain Preamp Volume Control for Ipod MP3 Phone
Aliexpress UK