- LED flashes when wireless frequency commonly used by spy cameras is detected (note that it is not as sensitive and accurate as professional frequency scanners/detectors?DX carries)- Powered by 3 x LR41 batteries (included)- Dozons of spare batteries included- Working ball pen- Also features UV LED for tracking blood and validating watermarks/banknotes/money                                                                                                                                Dimensions: 4.72 in x 0.39 in x 0.39 in<br />Weight: 3 oz