Daioolor Middle Grade Sound Quality Earhook Bass Earbuds Headphones Detachable Hook Sports Earphones for Running Detachable Ear hook (for running and outdoor) and Microphone Control. Self-illuminated in the darkness without battery. (shall place it in the light for 10 minutes to let it recover this self illuminated function if it has been stay in inventory for weeks) You Will Get it Free as Compensation in 1 Month If Met Defective Item (Please Return it to AMAZON CUSTOMER SUPPORT to Prove that is Defective and Send Email to Seller as Reminder).