do you mean the headset is bad?
No
and since it doesn't have a sound card, is it gonna use the motherboard soundcard?
Headphones (wired and wireless) work similar and they usually do not have built-in sound cards. ..they just use different means to get the sound into the headphone drivers (speakers).
Since the Soundcore Life Q30 are Bluetooth headphones, the device you are connecting it to must also have Bluetooth...otherwise it won't work.
If you are connecting it to a laptop, most laptops do have Bluetooth built-in
If you have a desktop, check if it does have Bluetooth, otherwise you will need to buy a USB Bluetooth dongle.
(iam not familiar with how wireless headsets work)
As the name implies, wireless headphones receive their audio signals wirelessly instead of using headphone cables.
Wireless headphones work by receiving wirelessly transmitted audio when paired to a device (computer, smartphone, TV, receiver, etc.).
The encoded audio is transmitted via radio frequencies or infrared (less common). The headphones receive and decode the audio signal.
Wireless headphones have built-in receivers that accept the wireless waves that carry the audio signal that makes the headphone drivers produce audio.