1: The appearance is simple and efficient, beautiful and generous 2: Frequency bandwidth, high sensitivity, 100KHz-1000MHz (with antenna is 400-470Mz, use different frequency antennas to test signals with different frequencies for better effect and sensitivity) 3: The pointer amplitude can be adjusted (to protect the meter) 4: Built-in automatic damping function, which is the buffer function, prevents the needle from swinging too fast and causing damage. 5: Small size, easy to carry, size: 90*115*70mm (excluding the raised antenna part) 6: Test sensitivity: 0.1w transmitter distance 0.1-1 meters 2W/5W transmitter, 1-3 meters range. The 10W transmitter is in the range of 2-5 meters. 50W is about 3-10 meters. With the HP8921A radio comprehensive tester, the sensitivity is -20dbm, and the -2dbm can be full. (The video rate is different and the sensitivity will be different) Instructions for use: use, rotate the "amplitude adjustment" to the leftmost end. The length of the antenna to be pulled depends on the frequency of the test. It is better to have 1/4 wave as much as possible. The handheld walkie-talkie is about one meter from strength meter. 't be too ! In order to avoid the signal is too strong to burn strength meter! Then press the walkie-talkie PTT button to make the walkie-talkie enter the launch state. At this time, the pointer of strength meter should have a signal indication. The stronger the signal, the greater the indication! Colour:As Shown Material:plastic Package Contents: 1 x Indicator Meter Only the above package content, other products are not included. Note: Light reflection 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.