Bluedio R 8 Drivers Bassy Wireless Bluetooth Headphones with Micro SD Card Slot (Black)

Warranty and Customer Service information:
1 year warranty from the date of purchase
Email Bluedio Customer Service, get answered under 24 hours
To email Bluedio Customer Service: you can click "Your Account" on Amazon, click"Your Orders", find the Bluedio order, click "Contact Seller".

Specification:

Speaker: woofer*2 tweeter*6
Bluetooth version: 3.0
Bluetooth operating range: about 20 meters
Bluetooth music time/talk time: 12-20 hours
Micro SD card music time: 12 hours
Standby time: about 325 hours
Charging time: about 3-4.5 hours
Battery: Li-polymer battery
Audio jack: 3.5mm
Bluetooth profiles: A2DP, AVRCP, HSP, HFP
Impedance: 100Ω (50mm)、32Ω (13mm)
Frequency response: 15Hz-22,000Hz
Operating temperature range: -10 ℃ to 50℃ only
SPL: 110dB
Headphones dimensions: 190*190*80mm
Package dimensions: 280*170*96mm
Headphones weight: 283g
Package weight: 850g

In the box:
R Bluetooth headphones
USB charging cable
3.5mm audio cable
Drawstring carry bag
User manual