B-STOCK. This is a product which has been returned by a customer within their 14-day money-back guarantee or opened by our team to test. Fully functional and come with a full warranty. --Specification: Hybrid drivers: 2 dynamic + 2 balanced Frequency response: 10Hz - 40kHz Sensitivity: 108db/mW Impedance: 30 ohms Connector: 3.5mm mini jack Cable length: 1.2m Weight: 20g Product Included: Foam case, 3 pairs of memory foam caps, 2 pairs of rubber caps Black colour