Frequency Range :20-20000 (Hz)
Impedance ：32Ω
Sensitivity :105 (dB)
Wire length: 1.2 plus or minus 0.5 (m)
Connection Type :3.5mm
Connection Type: Wired
Product Height :9 cm
Product Length :19 cm
Product Weight: 0.38 kg
Product Width/Depth :13 cm

• 8″ HD display, 2X the storage (32 or 64 GB of internal storage and up to 1 TB with microSD card) + 2 GB RAM. 10th generation (2020 release).
• All-day battery life – Up to 12 hours of reading, browsing the web, watching videos, and listening to music.
• Now with USB-C for easier charging. Fully charges in under 5 hours (with included cable + adapter).
• 30% faster thanks to the new 2.0 GHz quad-core processor.
• Enjoy your favorite apps like Netflix, Facebook, Hulu, Instagram, TikTok, and more through Amazon’s Appstore (Google Play not supported).
• Stay on track – Check email, make video calls, update shopping lists, and set reminders. Use your favorite apps like Zoom, Outlook, and OneNote.
• Hands-free with Alexa, including on/off toggle.

Bluetooth Version: 5.0
Battery Capacity: 300mAh
Play Time: 20h
Charging Time: 2h
Diameter: 40mm
Impedance: 32Ω
Sensitivity: 98±3dB at 1000HZ
Best Transmission Distance: ＜1M
Maximum Transmission Distance: 10M
Wearing Method: Head-Mounted

-Model number: A770BL
– Bluetooth version: 5.0
– Battery capacity: 250mAh
– Standby time: up to 25h
– Talking time: up to 10h
– Playing time: up to 13h
– Charging time: 1h
– Transmission distance: up to 10m
– Frequency response: 20-20kHz
– Connectivity: Bluetooth, 3,5mm aux-in