The sensor on this audio gadget senses the vibrations hitting the walls, ceiling and floor and amplifies them so that you can listen to whats being said. If the waveband is low, meaning people talking in a lower note, then you can use the dial located at the back of this cool audio gadget to adjust the volume and increase the sensors amplification. It really makes more fun and productive.Lets face it, no one really tells the truth straight to your face. So why not find out the truth, you will be amazed what people might say when your whether you are in a motel room, hotel room, your apartment or just in the next room the device will let know whats being said. Primary Function: Audio Listening Device Materials: Molded Plastic with Internal Sound Amplifier Color: Silver /black Onboard Buttons/Slots: > 3.5mm Earphone Jack > USB IN > Sensor > ON/OFF Switch Button with volume Dial Power: Built In Rechargeable Battery Dimensions: L:43 x Diameter:36 (mm) Package Content. Wall Door Listener Bug X 1 USB Cable X 1 Earphone X1. Because other country no e-packet services , item will send from China via Singapore Post. We wish to build a long time friendly partner relationship with you. The item "Spy Ear Audio Listening Device Amplifier Bug Sound Amplifier Hearing Wall Gadget" is in sale since Friday, April 7, 2017. This item is in the category "Consumer Electronics\Gadgets & Other Electronics\Surveillance Gadgets". The seller is "sqk1010" and is located in , . This item can be shipped worldwide.