Product Description: When it detects sound, call your cell phone. When it detects sound, call your cell phone. You can charge the audio device by connecting the USB charger to a power charger.<br><br>Colour:black Material:plastic This two-way GSM audio device call you when it detects sounds around you. How great is that? Simply insert a GSM SIM card and set it to your desired phone number to call back! Want to know what people are saying behind your back? Now you can know from a distance. You can even place more than one of these audio devices in your bedroom, living room, conference room or office wherever you need them. Simply insert a SIM card into the audio device and your bug is up and ready to go! This two-way audio device has two amazing features: (1) Make a call to the audio device and you can listen to the conversation immediately! The built-in microphone has a working radius of up to 7 meters, so you can install anywhere! (2) When the audio device hears someone talking, it calls you! This feature makes it more advanced than other GSM audio bugs on the market today. Hotspot: Audio Widget Auto Dialing Option Tri-band GSM audio device<br><br>Package Contents: 1 * audio monitor 1 * data cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.