Cyber Acoustics ACM-500R Multi User Stereo Headphones CONTROL AT YOUR FINGERTIPS: 40mm dynamic drivers produce quality sound, and the volume controls on the ear cups make it easy to control your audio levels at all times. The stereo/mono switch lets you decide if you would prefer to hear from one driver or both. ONE SIZE FITS ALL: With an adjustable headband and leatherette ear pads, these on ear headphones can be adjusted to fit most head sizes. EASY TO USE: Simply plug in and play, no installation needed. Connect single 3.5mm plug directly to your desktop computer, laptop, tablet, smartphone, MP3 player or gaming system. 1/4 adapter included for additional connection options. Separate volume control on ear cups. DURABLE DESIGN: These headsets are hardwearing and long lasting, which is vital when being frequently used in school and businesses. The robust coiled cord is ultra-durable and student proof! QUALITY GUARANTEED: Includes 1 year hassle free warranty.