brand new and high quality Features: It is capable of measuring frequency parameters such as continuous for carrier signals (interphones) and with signal strength indication. Auto switch off, single button control with collapsible whip antenna. This is a frequency counter for two-way radio and mobile phone. A necessary tool for the signal testing and radio maintenance. Frequency test device, digital display design, can clearly display the frequency parameter. Powered by a 9V battery, wide measurement range is 50MHz-2.4GHz. This is the preferred tool for maintenance personnel and radio enthusiasts to test frequency and signal strength. Specification: Material: Plastic, Electronic components Size: app.9.4 x 5.7x 2.3cm/3.7 x 2.2 x 0.9in Color: As the pictures shown Quantity: 1 Pc Product Parameter: Frequency Step : 200K (digital radio signal), 1K, 100Hz (Optional) Frequency Test Range: 50Mhz - 2.4Ghz Battery: 1 x 9V Battery (Included) Antenna: pulling out antenna Instructions: Operation: Single button for all functions. Press the multi-function button to boot Display the Menu - release the button, return to the operating mode before shutdown. Continuous pressing to select step 200Krelease button to enter 200K digital signal dedicated mode. Continuous pressing to select step 1K Release button to enter 1K resolution mode (sampling fast). Continuous pressing to select step 100Hz release button to enter 100Hz resolution mode (high precision). After entering the working mode by continuous pressing(1K, and 100Hz), and entering the working mode (200K), there are 2 different instructions: Working Mode (1K, and 100Hz): Quickly press the multi-function button and release it. Lock screen to display content. Press the multi-function button again quickly and release it. Unlock the screen. Press the multi-function button for more than 2 seconds. Show shutdown prompt. Release the button, shut down. Working Mode (200K): Press multi-function button. Show shutdown prompt. Release the button, shut down. Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Frequency Counter Tester