Designed for measuring 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 testing result is more reliable. With an external antenna, it can only measure frequency with non-contact way. Fequency measurement range: 1MHz-2400MHz. Power measurement range: 0.1W-50W. Ideal tools for signal testing and radio maintenance. : Frequency Measurement: 1MHz-2400MHz Power Measurement: 0.1W-50W Sampling Time: .0.2s Working Temperature: 0-40 Celsius Current Consumption: .100mA Power Supply: 3 x 1.5V AAA Batteries(not included) Item Size: 9.5 x 5.5 x 2.5cm / 3.7 x 2.1 x 1in Item Weight: 86g / 3.1oz Color: Yellow Material: Plastic + metal Package List:1 x Frequency Counter (battery not included) 1 x Antenna 1 x Pair of Cable 1 x User Manual 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 +/- 1-3 cm.