Bluedio Power Sound. Shipped with USPS Priority Mail.

Bluetooth version: 4.1

Bluetooth transmission frequency: 2.4GH to 2.48GHz

Bluetooth profiles: A2DP, AVRCP, HSP, HFP

Frequency response: 50Hz - 20,000Hz

Audio input: VRMS<1V

Bluetooth operating range 33 feet’s

Standby time : about 1000 hours

Bluetooth music/ talk time : 5 hours

Charging time : 4 - 5 hours

Audio input power : 2*2.5W+5W