BULK VALUE: 50 sets of wired headphones, perfect for use in classrooms and schools. COMFORTABLE DESIGN: On-ear style headphones with padded ear cushions and adjustable headband for extended wear COMPATIBILITY: Standard 3.5mm audio jack connects to most devices including computers, tablets, and media players CLASSROOM READY: Ideal for computer labs, testing centers, and educational settings with clear audio delivery Waneni Promise: Waneni is an US brand, ALL Headphones 18-Month Warranty and Lifetime After-sales Service.