Specifications:
BT version 3.0 + EDR, connectivity up to 30ft/10m
Bluetooth protocol supported: A2DPAVRCP
Frequency range: 2.401-2.480GHz (2.4GHz ISM segment)
The receiver sensitivity: <-90dBm, BER <0.1%
SNR: 95dB
Distortion: <0.2%
Frequency response: 20Hz-20kHz
Operating temperature: -10 to 55°C
Coincide with IEEE802.11
Output power: 3W

Features:
Wireless BT playing
Aluminum housing + net
Pure tone, 360 degrees strong bass
AUX input (3.5mm jack connect with external music source)
Earphone output (3.5mm) jack
USB port/TF card slot
FM radio, built-in FM antenna
Pre/next/volume +/-/play key
Built-in Li-ion battery 600mAh, no less than 5-6 hours playback
Bass passive radiator for powerful bass
Micro USB charging port
Silicone pad prevent movement while playing strong bass
Optimal NFC BT auto connection extra cost $0.8
Assembly: micro-USB charging cable, audio cable, user's manual