"Panasonic XBS" drivers:

• Panasonic made (RP-HT21) 30mm large diameter neodymium drivers with XBS bass boost port that magnifies low-frequency sound for full, robust pumped up bass response 
• Panasonic drivers are arranged in my innovative "Flying Echelon™" staggered configuration with Left driver in the up position and staggered back from Right driver in the down position nearer your ear embedded with an acoustic diaphragm 
• Great for stereo audio listening and gaming
• Compatible with all smartphones, computers, gaming consoles and all audio devices that use a 3.5mm stereo jack output  
• 3.5mm right angled jack for added durability to prevent shorting and the approximately 4' long audio cable threads comfortably through clothing and bags 
• 100 dB Sensitivity (The consensus is that exposure to sounds louder than 85 to 90 decibels over an extended period of time can contribute to hearing loss so please always keep your listening volume at a safe level.)
• Stress relief of soldered wired connection to the drivers for added wired connection durability is standard on 2E1 all models
• 24 Ohms Impedance (Headphones with high impedance (25+ ohms, approximately) tend to need more power to deliver higher audio levels. High impedance protects from damage caused by overloading and can also be used with a wider range of audio equipment but may require a headphone amp pairing for low voltage devices like portable music players, smartphones & wireless gaming controllers, etc. to achieve optimum audio performance.)
• 1000 mW(*IEC) Power Handling Capacity
• 16Hz - 22 kHz frequency response for natural-sounding mids and highs along with resonant XBS bass port boost and natural treble
• Made using Caldwell premium folding hearing protectors housing the Panasonic XBS drivers 
• One size fits most adults and children 
• Durable stainless steel banded retractable headband and super soft foam ear-pads over shockproof ear-cups shell
• Compact folding design
• Headphone weight approximately 8.2 ounces
• Passive ambient noise cancellation allows you to better hear your sounds at lower volume and does not allow sound to leak out
• Can be worn comfortably with eyeglasses, hearing aid devices 
• Hollow ear-cup for the deaf ear is vented for cooling comfort and can be used as a convenient storage compartment for rolling up and storing the cable inside

I can also recommend purchasing my hand-sewn storage bags for your 2E1 headphone and I will refund the storage bag's shipping charges back when purchased at the same time as the 2E1 headphone since it will ship with your 2E1 headphone order.