Koss ED1TC Hb Stereophone Ideal for Schools Libraries & Trng Dept Description Take the Description from here http: //www. Combination/end/products/headphones/on-ear- headphones/ed1tc__ed1tc_insitutional_headphones. Features: Earpiece design - Over-the-head Earpiece type - Binaural Minimum frequency response - 100 Hz Maximum frequency response - 20 kHz Connectivity technology - wired.Sensitivity: 98 dB Product Details: Brand: Koss Model Name: 182197 Color: Silver Form Factor: Over Ear Connectivity Technology: Wired Brand: Koss Model Name: 182197 Included Components: headphones Age Range (Description): Adult Model Number: 156548 Package Type: Standard Packaging Unit Count: 1.0 Count Number of Items: 1 Warranty Description: Koss Specific Uses For Product: personal Connectivity Technology: Wired Wireless Communication Technology: Bluetooth Headphones Jack: 3.5 mm Jack Compatible Devices: PC Form Factor: Over Ear Ear Placement: On Ear Color: Silver Is Autographed: No Item Weight: 3.5 Ounces Cable Feature: Durable commercial and institutional headphone Plastic ear cups for convenient cleaning Durable design for multiple users, young and old 4-foot cord and 3.5mm plug Covered under the Koss Stereophones Limited Lifetime Warranty