Characteristics and Interoperability Bluetooth Earbuds GJBY TWS CA-2. Excellent sound quality, comfort, and lightness. Play your music wherever you go. Earphones with Bluetooth GJBY TWS CA-2 Bluetooth 5.0 + EDR, 4-5 hours of operation, 30 minutes of charging Excellent portability, light weight, and sound quality. comes with a charging case.