CTL920 Wireless Bluetooth Earbuds with Noise Cancellation - Premium Sound Quality for Gym, Running, Travel & Work

The Panasonic CTL920 is a button-type Cobalt Titanium Lithium (CTL) battery that uses lithium titanium oxide as the positive material, carbon as the negative material, and organic electrolyte. Sometimes Panasonic will insert a "A" or "F" i.e. "CTL920F" for their internal use and is the exactly same as CTL920.