Green Lee-Compact-Digital-Services-Protection-DSP-Test-Telephone-Greenlee-50647792-P-The-Compact-DSP-Test-Telephone-is-a-Pocket-Size-Fully-Featured-Instrument-suitable-for-use-by-anyone-involved-in-the-maintenance-&-installation-of-analogue-telephone-circuits-P-P-The-Compact-DSP-Digital-Services-Protection-Test-Telephone-has-been-designed-to-operate-safely-in-situations-where-telephone-wiring-may-be-carrying-Digital-traffic-Voltage-feed-to-remote-electronics-or-Hazardous-voltages-th