Greenlee 200EP-G BOX and 700C Tone Probe Carrying Case Combo Greenlee 200EP-G-Box and Greenlee 700C Carrying Case High gain for accurate wire identification in congested cable bundles and equipment rooms Used in conjunction with any tone generator, tone probe amplifiers permit wire and cable identification Features a powerful speaker for noisy environments, Recessed on/off button control Includes adjustable volume control for precise identification