Smart-Trek mini headphones with In-Line volume control and 3.5mm TRS Plug the durable and sleek Smart-Trek mini headphones are versatile and compatible with a wide variety of technologies. Designed to stand up to the K-12 environment, Smart-Trek headphones are built to last. Smart-Trek school headphones feature a durable and comfortable design, so teachers can have headphones that will function for years, and students can wear the headphones for an extended period of time. Its adjustable headband snaps easily into place to fit students of all ages. The ear cups are easy to clean, durable, and provide excellent noise-isolation. Smart-Trek mini headphones feature the trusted.DetailsBlack and silverMeasures 6” x 5.6” x 2.5”Made of Leatherette ear cushions, PVC-jacketed braided nylon cordSpeaker drivers 40 mmFrequency response 50-20,000 HzSensitivity 100 dB ± 4 dBImpedance 32 OhmPlug type 120° 3.5 mm TRSFor ages 4 and up