3.5mm plug Earphone Headphone w/ Microphone MIC VOIP Headset Skype for PC Computer Laptop A 1.5m long cable that is ideal for outdoor use. The ideal cable length to give you the freedom to put your audio device where you want. 30mm speaker driver delivers big sound performance. Compact for wearing comfort yet big enough to deliver crisp, powerful sound, the 30 mm speaker driver is a perfect size for non distorted listening enjoyment. Copper cladded aluminium wire improves sound quality.