Uses positive laser scanning and passive wireless sweep method - Can find out eavesdropping devices Telephone eavesdropping digital eavesdropping tracking vehicle eavesdropping wireless pinhole cameras wired cameras electrical appliances and other sources - Can effectively prevent eavesdropping videotaping fraud; protect personal privacy data and information confidential - Features flashlight & clock functions - Detecting range: 5~20cm - Detecting frequency range: 1MHz~6.5GHz - Light tone vibration multi warning methods - Alarm time delay: 1s - Working voltage: 5V - Built-in 180mAh lithium battery - Power supply: 5V/500mA - Accessories included: - 1 * 2.5mm earphone - 1 * 100~240V power adapter - 1 * Chinese/English manual