Brand: Audio-Technica Solid Bass Type: Completely independent, separate left and right Headphone type: Canal type Color: Blue系 (Blue-based) Wireless/Wired: Wireless Headphone features: Microphone, Automatic power-on, Automatic power-off, Remote control Low-frequency response (Hz): 5 Hz High-frequency response (kHz): 40 kHz Impedance (Ω): 16 Ω Sensitivity (db): 110 db Wireless standard: Bluetooth Bluetooth version: Bluetooth 5.0 Bluetooth codecs: aptX, AAC, SBC Driver type: Dynamic Driver size (mm): 10 mm Charging port: USB Type-C Charging time: 2 hours Weight (g): 8 g No box. The right ear hook is missing (see photo 3). They may fall out when moving your face, such as when running, so I recommend using them indoors. As expected from Audio-Technica, the deep bass is excellent.