Bzzz, flash, screech — that’s your cell phone being left behind. Well, actually, that’s the new ZOMM Wireless Leash, a little round keychain-sized device that, when activated, uses Bluetooth technology to detect and sound an alert when you and your Bluetooth-enabled cellphone become separated by 20 to 40 feet. The Bluetooth connection also lets the ZOMM act as a speakerphone, so you can answer an out-of-reach phone with the press of a button. A built-in panic-button feature lets you initiate a piercing alarm, and auto dials 911. Alas, it can’t keep the phone battery going or boost reception. But stay tuned.

Zomm Wireless Leash is $79.99 at www.zomm.com; 888-821-0888