The main unit and earphones have been confirmed to charge. This is just the case, as the earphones are sold separately. I used them for about 4 months, but I lost the right earphone, so I decided to buy a new set. Thank you. Wireless Stereo In-Ear Headphones EAH-AZ40M2 Brand: Technics Wearing style: Separate left and right, completely independent Earphone/Headphone type: Canal type Color: Blue Wireless/Wired connection: Wireless Earphone/Headphone features: Noise canceling, Hi-Res, Microphone, Sound quality adjustment, Remote control Wireless standard: Bluetooth Bluetooth codec: LDAC, AAC, SBC Drive method: Dynamic type Driver size (mm): 6.0 mm Charging terminal: USB Type-C Charging time: 2.0 hours Weight (g): 10.0 g