This is an entry-level Bug Detector at a great price! This lipstick sized Bug Detector is easily and discreetly carried and comes complete with battery. It will detect any radio transmission on frequencies from 50 MHz to 3.0 GHz, which covers all bugs, wireless cameras and GSM units. It is remarkably effective for its size. It uses CR2032 batteries which are readily available in shops. The Bug Detector features a low battery warning and fuzzy scanning filter to avoid false bug warnings. Please note that it only detects bugs that transmit, not wired devices. This is because wired devices do not generate any radio frequency (RF) signals, and this Bug Detector can only detect RF signals. The size is only 79 x 28 x 15 mm, and weighs just 26g. Very simple to use, and full operating instructions are included.