Feature: 1. TESTING ANALOG RADIO SIGNALS: Frequency counter can continuously test analog radio signals (handheld radios, cordless phones, GSM cell phones, etc.) and digital radio signals, displaying frequency parameters and signal strength. 2. STABLE PERFORMANCE: Frequency counter can realize automatic shutdown, single key control, one key with all functions. Equipped with foldable whip antenna, stable performance and high reliability. 3. SCOPE OF APPLICATION: Radio frequency counter is used for automobile radio frequency test, marine radio frequency test, hotel, community, property and other radio frequency test. 4. BUILT IN 9V 6F22 BATTERY: Portable frequency counter has a built in 9V 6F22 battery, when the battery needs to be replaced, remove the back cover and install the battery before use. 5. RADIO FREQUENCY MEASURING TOOL: Portable radio frequency counter is the first choice tool for maintenance personnel, wireless enthusiasts to test frequency and signal strength. Specification: Item Type: Radio Frequency Counter Material: ABS Frequency Counting Resolution: 200K (Digital Signal Special), 1K, 100HZ, Optional Testing Distance: 450M About 8m / 26.2ft, 150M About 5m / 16.4ft Test Range: 50MHZ-2.4GHZ Battery Type: 9V 6F22 800mAh Alkaline Battery (Built In). Package List: 1 x Radio Frequency Counter 1 x Instruction Manual