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Cheap 3.5mm Single Side Hook Headphone for Tour Guide Interphone. Customizable Color: Available in Black with customized color options. OEM/ODM Service: Supports customization of Color, Logo, and Package. Certified Quality: Approved by CE, ROHS, FCC, and SGS standards. High Flexibility: PVC or TPE wire material, not easy to break. Wide Compatibility: Works with all 3.5mm plug audio devices. Noise-Cancelling: Moving-coil headphones with noise-cancelling function. Fast Delivery: Samples ship in 4-7 days; mass production by air or sea. 100% Tested: All products undergo 100% testing before shipment.