FCC documents revealed a new tri-band GSM 900/1800/1900 watch phone today called the SMS Mobile Phone M500. The watch phone offers many of the same features found on regular cell phones. Calling features include call waiting, mute and hold. The M500 also supports SMS messaging, audio and video playback and Bluetooth. There are keys on both sides of the watch that let users access and scroll through menus to make selections or input data. The lithium ion battery provides 100 hours of standby time and 120 minutes of talk time. The watch is not water resistant.