Panasonic Stereo Earphones with Neck Strap The Netsound 240 Stereo Earphones are designed for use with portable MP3 & CD players. The Netsound 240 provides you with great sound quality for all kinds of music & also features a neck strap for maximum comfort. Convenient neck strap for maximum comfort. Great sound quality for all kinds of music. Designed for use with portable MP3 & CD players. Excellent frequency response (from 20 Hz to 20 k Hz). High sensitivity (108 d B) for compatibility with all personal digital music players. Guarantee: 36 months.