Three-hole output design provides a two-in-one headset jack and a separate headphone jack, allowing two listeners to use the device simultaneously. Singing or voice support: supports microphone or audio connections, enabling a family KTV experience and more engaging voice-connected video chats. Volume control and mute: external volume adjustment knob lets you freely set the output level; a headset or microphone mute switch is included for convenient use. Broad compatibility: compatible with mainstream equipment; supports TRS and TRRS in two modes; suitable for most earphones; can convert the analog signal output from the interfaces of tablets, notebooks, desktops, audio devices, etc., into digital signal output. Use scenarios: - Family karaoke sessions at home with two listeners connected at once. - Voice chats or video conferencing with improved microphone and headphone integration. - Use with tablets, laptops, desktops, and other audio sources to convert analog signals into digital output for downstream devices.