This device is designed for tracking cables within walls or underground. It should never be used on live utility powered devices or cables. If unsure, consult a qualified electrician. **NF-816 Transmitter Specifications:** - Tone Frequency: 200kHz - Maximum Range: 1000 feet - Maximum Depth: 2 feet - Operating Current: < 70mA - Signal Voltage: 15Vp-p - Dimensions: 49 x 135 x 33mm **NF-816 Receiver Specifications:** - Frequency: 200kHz - Operating Current: < 70mA - Earphone Jack: 1 - Dimensions: 43 x 168 x 27mm **Product Dimensions:** 10.67 x 5.91 x 1.81 inches; 14.88 ounces This device helps in locating and tracking buried or hidden wires, suitable for pet fence wires, metal wires, pipes, and electrical cables. It can determine specific circuits and pinpoint drill sites, reaching depths of 2 feet and lengths of 1000 feet. **Warnings:** - Do not use on live circuits to prevent damage to the tester. - Designed for single-core or two-core parallel wires only; not for multi-core or bundled wires. - 9V batteries not included.