Thank you for your support to TinyDeal.
Please check the problem as following steps.
1.Check whether volume is set to 0.
2.It may be loose contact between earphone and cellphone/tablet PC., Please check the earphone jack and have a try.
3.Voice coil of earphone may be faulty. Please change a earphone to try.
Any questions please contact us by Customer Service Express: https://help.tinydeal.com/contact-us