Our pager size RF detector is designed for general use in detecting hidden cameras and wireless tapping devices on telephones/ This RF detector protects privacy within desired control areas. Three LED's warn the presence of hidden cameras or wireless taps and and audible alarm will change from slow to rapid indicating the strength of detected signal. Specifications: ¥ Detects wireless cameras up to 10 feet ¥ Detects cellular phones up to 20 feet ¥ 50MHz to 6.0 GHz detecting frequency ¥ 3V DC power (uses two AAA batteries, included) ¥ ¥ 3 warning modes ¥ 1-Sound & 3 LED's ¥ 2-Vibration & 3 LED's ¥ 3-Silent 3 LED's and earphone output. Includes: ¥ Ear piece ¥ Pocket clip SIZE: 3 1/4" x 2 1/8" x 1"