Product Specification:
Speaker Driver: Bass Ring 10mm Speaker
Speaker DC Resistance: 32 ohm
Bluetooth Version: 4.1 
Power Level: Class II
Operating Voltage: 3.5V -4.2V
Microphone Sensitivity: 43db+-2db
Bluetooth Frequency band: 2.4-2.48Ghz
Bluetooth Range: 10m 
Audio Transport protocol: A2DP/AVRCP
Power Indicator: Red light on when charging, blue light on when fully charged
Distortion: 0.1%
Maximum Output power: 1.4mW
SNR: 75 db
Playing time: 8 hours