This is where the term Wireless Leash comes from. Using Bluetooth® wireless technology, the ZOMM alerts the user when it becomes separated from his/her mobile phone by vibrating, flashing its lights and sounding an alarm. It's pretty obnoxious so you won't miss it. It gets increasingly louder. The Wireless Leash by ZOMM is also a fully-functional hands-free speakerphone with one touch answering for those times when it isn't safe to talk on your phone. It has a quick release mechanism for easy removal from the rest of your keys. The additional Car Kit has a mount that clips on your visor.