Xtech Sphere Bluetooth Headphones

-Maximum power output (R .M .S .): 40mW
-Frequency response: 100Hz-20kHz
-Signal to noise ratio: 80dB
-Sensitivity: 119±3dB
-Color: Black
-Microphone:
-Directivity: Omnidirectional
-Frequency: 100Hz-10kHz
-Impedance: 680?
-Sensitivity: -42dB +/-3dB
-Type: 300mAh , lithium polymer
-Charging time: 2 hours
-Run time: 12 hours*
-Standby time: 30 hour
-Charging method: Micro USB (5V/500mA)
-Connection type: 3 .5mm wireless technology
-Wireless RF frequency: 2 .4GHz-2 .480GHz
-Memory slot: Supports micro-SD™ cards**
-Wireless range: 33ft
-Cable length: 4 .4ft