ExpertPower XP-617_1N Listen Only Acoustic Earpiece with 3.5mm Connector Connection Type: Universal 3.5mm connector fits two-way radios, radio speaker mics, MP3 players and similar devices Earpiece: Clear, hypo-allergenic acoustic tube gives a discreet look and provides perfect sound clarity. Durability: Flexible and durable high grade Kevlar cable for demanding applications. Uses: Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments. Guarantee: Purchase Expert Power products with ease of mind with our 1 Year Warranty