1: Simple and effective appearance, beautiful and generous. 2: Frequency bandwidth, high sensitivity, 100KHz-1000MHz (with antenna, it's 400-470MHz; use different frequency antennas for testing signals at different frequencies for better effect and sensitivity). 3: Pointer amplitude can be adjusted (to protect the meter). 4: Built-in automatic damping function (buffer function) prevents the needle from swinging too quickly and causing damage. 5: Small size, easy to carry, dimensions: 90*115*70mm (excluding the raised antenna part). 6: Test sensitivity: 0.1w transmitter distance 0.1-1 meter; 2W/5W transmitter, range 1-3 meters; 10W transmitter is within 2-5 meters; 50W is about 3-10 meters. With the HP8921A radio comprehensive tester, sensitivity is -20dbm, and -2dbm can be full. (Video speed varies, affecting sensitivity). Instructions for use: Before use, turn the "amplitude adjustment" to the leftmost position. The length of the antenna to be extended depends on the test frequency; it's best to have a 1/4 wavelength. Keep the handheld walkie-talkie about one meter away from the power meter to avoid the signal being too strong and burning the meter. Then, press the walkie-talkie's PTT button to put it into transmit mode. At this point, the power meter's pointer should show a signal indication. The stronger the signal, the greater the indication. Color: As shown Material: Plastic Package Contents: 1 x Indicator Meter (Note: Other products are not included. Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.)