With any GSM SIM card inserted this unsuspecting watch becomes a fully featured power house of a cellphone, with bluetooth, MP3, camera and personal organizer. Easy charging is achieved via USB, as is data transfer. The watch itself features a durable rubber blend strap, gun metal gloss surround and chrome detailing. The kit comes with two batteries, 512 MB micro SD card, stand alone charger and a bluetooth headset, so you'll be ready to go straight out of the box. You can easily make calls with the supplied bluetooth headset, or by using the watches built in microphone and speakers. With all of the features of a modern mobile phone slapped on your wrist you'll never have to worry about losing your phone and you'll lighten the load .