OBlanc Shell NC3 2.1 channel - 40mm for subwoofers and 30mm for left/right channels with AMP

Product Overview
The OBlanc SHELL 2.1 Headphones with Treble and Subwoofer Dual Drivers in each Ear Cup takes your movies, music , gaming and entertainment to a whole new level.
The built-in rechargeable battery powers amplified subwoofer in each ear cup improves vocals, and deeper bass provides you with a fuller, cleaner theatre sound that you can feel.
It is more than you can desire for a  State-of-the-art Listening Experience.

Features
•2.1 Amplified Stereo Channel with Independent Bass
•Gold Plated 3.5mm 4-pole Connector Compatible with Smartphones, and Tablets
•Extreme Comfort and Fit Leatherette Ear Cups
•2 Neodymium Drivers In Each Ear Cup:
-30mm 32Ω for Treble
 -40mm 32Ω for Bass
•Volume Controls: (Can be Adjusted Individually)
-Main Volume
-Bass Volume
•Tangle-free Cord with In-line Microphone and Call Control
•Rechargeable 450mAh Battery (Up to 10 Hours Per Charge)
•Acoustic Design: Dynamic, Closed-back

Specifications
•Acoustic Design: Dynamic, Closed-back
•Frequency Response: 20 - 20KHz
•Speaker Sensitivity: 116dB SPL (1mW) @ 1KHz
•Total Harmonic Distortion (THD): <1% @1KHZ / 0.775V
•Maximum Input / Output Power: 200mW / 40mW
•Microphone Size: 4mm x 1.5mm
•Microphone Sensitivity: -58dB
•Cable Length: 62"
 
Package Includes
•OBlanc SHELL Subwoofer Headphone w/In-line Microphone
•3.5mm Mic/Line Audio Cable for Computers, and Laptops (42")
•47" USB Charging Cable (Type-A Male to Mini Type-B Male)
•Warranty Pamphlet
•OBlanc Rubber Key Tag