Greenlee Tempo ( A Textron Company) - Progressive 701K combines the 77HP toner and 200EP probe for a complete kit that applies tone to cabling and with use of the probe helps to identify that cabling throughout the wiring scheme. Probe Specifications: Gain ( nominal) : 30 dB Input Impedance ( nominal) : 100 M ohm Metal tip resistance: 0 ohm Plastic tip resistance: 300 ohm Headset: 3.5 mm stereo plug: 8 ohms mimimum Battery: 9 VDC Battery Life ( Nominal) : > 50 hours Length: 231 mm Width: 55mm Depth: 28 mm Weight: 145 g Operating/ Storage Temperature: 0 C to 50 C ( 32 F to 122 F) Generator Specifications: Talk Battery ( into 600 ohm) : 4.6VDC Output Power ( into 600 ohm) : + 10dBm Resistive Short Visual Indication: