Elmer's All Purpose School Glue Sticks, Washable, 30 Pack, 0.24-ounce sticks

Koss ED1TC Hb Stereophone Ideal for Schools Libraries & Trng Dept

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Product Review

take the description from here http://www.koss.com/en/products/headphones/on-ear-headphones/ED1TC__ED1TC_Insitutional_Headphones

Earpiece design - Over-the-head
Earpiece type - Binaural
Minimum frequency response - 100 Hz
Maximum frequency response - 20 kHz
Connectivity technology - wired.Sensitivity: 98 dB

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Elmer's All Purpose School Glue Sticks, Washable, 30 Pack, 0.24-ounce sticks