ProHT Multimedia Headphones (87051) Over-ear Bass Sound Stereo Headphones with Volume Control & Durable Ear Cushion, 3.5mm Miniature Jack, Black Superior bass sound stereo headset- For higher quality sound reproduction for voice music. In-line volume control- Convenient volume controller on cable. Compatibility- Compatible w/ all sound cards and portable music device w/ a female 3.5mm plug. Comfort padded ear cups - Soft ear cushions provide a perfect seal for perfect sound. Height adjustable headband. 100% quality guarantee,1 years warranty Connectivity technology : Wireless