Designed to measure the frequency and power of radio equipment such as walkie talkie and car-mounted radio device. Built-in dummy load, convenient to use and the test result is more reliable. With an external antenna, it can only measure the frequency with non-contact way. Frequency Measurement Range: 1 MHz-2400 MHz. Power measurement range: 0.1w-50w. perfect tools for test and maintenance signal. Sampling Time: .0.2s Working Temperature: 0-40 C Current Consumption: .100mA Power Supply: 3 * 1.5v AAA Batteries (not included) size:9.5*9.5*2.5cm colour:Black + yellow Material:metal Package Contents: 1 * Frequency Counter (battery not included) 1 * Antenna 1 * Pair of Cable 1 * User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.