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http://www.amazon.com/Syllable-D50-Bluetooth-Blackberry-Smartphones/dp/B00X57CDV4/ref=sr_1_3?ie=UTF8&qid=1438844347&sr=8-3&keywords=mono+bluetooth++headphone
Specification
Impedance：16 OHM
Bluetooth Version：Bluetooth V3.0+HS
Power level：CLASS II
Output power：20mW THD+N=1％
Bluetooth distance：W/O obstacles≦10M
Audio frequency response：80HZ-20 KHz
Bluetooth frequency range: 2.402-2.480GHz
Working voltage range：3.0V-3.7V
Sensitivity: -86 dB 0.1≦
Microphone Sensitivity：-453dB