Detailed Description  USB gift set for : 1.Retractable MP3 Earphone:a Patent Earphones single-pull design.  b Dual stereo track with 3.5mm plug. c With polished housing. d Earplug design with speaker. e Supports iPods, iPhones, MP3/MP4 players. 2.MINI Microphone: a Patent Miniature Microphone. b 3.5mm jack. c Compatible with laptop and portable record equipments. d Can rotate 180 to 360°. e Frequency response: 50 to 60Hz. f Sensitivity: -39 ±3dB. g S/N ratio: more than 58dB. h RoHS compliant. 3.Logo printings are accepted. this elegant USB gift set is fationable, practical and ideal for promotional gift purposes, such as, trade show, promotional gift for potential customers,personal or staff use.