Belkin pro series usb extension cable 18m overview the pro series usb extension cable extends the length of your usb device cable to your hub pc or mac perfect for devices with short cables features molded strain relief and pvc overmolding to ensure a lifetime of error free data transmissions supports up to 127 devices on a daisy chain configuration hotpluggable flextec cable jacket is extremely flexible for use in tight areas gold plated copper contacts provide maximum conductivity