Philips 2236 Stereo Headphones for Transcription (LFH2236/00) Ultra-lightweight headband improves comfort and fit-ideal for extended use 30mm speaker driver made of composite Mylar material-delivers sound without audible distortion Reinforced cable connection ensure durability Optimized for transcription use Frequency response: 18Hz-20kHz Connectivity technology : Wired Reinforced cable connectors ensure quality and durability Ultra lightweight headband improves comfort and fit Optimized for transcription use 30mm speaker delivers big sound performance to produce undistorted listening enjoyment Bass beat vents allow air movement for better sound