Hawksweep Portable Wireless Signal Finder Radio Frequency Bug Detector Working with selectable six working modes. (Silent Mode, Sound Mode, Vibration Mode, Cell Phone Locking Mode, Acoustic Mode, Guard Mode) High precisely to locate the wireless signal source. Locking all the phones calling in or calling out or sending SMS. Headphone port design to make the detection in any kind of environment, volume adjustable as required. With Internal built-in Li battery last working 1 hour. Easy to change the battery charging while working.