Are you curious about the events that are unfolding in the room by yours? Would you like to hear what people say about you when you’re not there? Then you might be interested in a high tech listening device.Everything is high-tech nowadays that you won’t be surprised to find so many gadgets which you can use in everyday life. Among these gadgets, the two-way listening device is considered very useful especially in investigative work. It is used as a tool for listening over conversations done in another room, particularly abutting where you’re located. The best part is they won’t even know you’re eavesdropping.What’s groovy as regards these devices is that they are so simple your grandparent could use it.Perhaps you’re wondering how effective this spy gadget is. It uses the most advanced technology that enables you to hear the vibrations of sound as they crash into the wall, ceiling, and the floor. This includes hearing the voices of people that come in wavebands which are then amplified by the mechanism.So how do you go about using this gadget? It’s very easy that even a kid can use it. Here are the steps to make it easier for you to get started:1. Switch on the audio listening device.2. Insert the earphones on the slot provided for them.3. Get the audio bug provided and stick it on the wall where the people you want to spy on are having their conversation.4. Adjust the volumes so you can hear cogently.While an audio listening device proves to be very useful, there are some things you need to consider when using this device. Its effectiveness lies on the following factors:* DistanceThe nearer you are to your subject, the better the audio will be. However, if you can’t go nearer to your subject, you can stay a short distance away. This especially sensitive device can amplify sounds even if you’re 10 meters or so away provided that the people you want to hear are chatting in loud voices. * Thickness of the wallsYou can stick the device on wooden walls, floors, steel plates and several more which are about 6 to 10 inches thick. In cases wherein the partitions are too thin, be sure to adjust the volume meticulously to prevent damaging your eardrums.* Battery lifeA built in rechargeable battery and charger are provided. To ensure you get worthwhile sounds, check your batteries before using the gadget. It works best when fully charged.Audio listening devices are normally used by professional investigators. However, you can buy one for yourself and start spying on your family and friends. This accessible implement is a must-have for those who love some thrill and amusement in spying on people.