Amazon.com: Synergy Digital Wireless Headset Charger, Compatible with JBL Tune 500BT Wireless Headset, 3 Ft. MicroUSB to USB (2.0) Data Charger : Electronics
Micro-USB Headphones, Earbuds Short Charger Cable, Compatible with JBL Live 400BT, 500BT Charger, USB to - Walmart.com
Amazon.com: GEEKRIA USB Headphones, Earbuds Short Charger Cable Compatible with JBL Tune 500BT, Tune 700BT, 450BT, Live 500BT Charger, USB to Micro-USB Replacement Power Charging Cord (1 ft/30 cm 2 Pack) :
I just bought my 500BT, what is the hole next to the micro USB charging port? : r/JBL