My cellphone.
I have a next-generation mobile phone is the LG P970, also known as LG Optimus Black.
I really like because it is very handy, I could live without it perfectly, but it helps me to do many of my tasks, like looking for information or pictures to work.
Usually I use to communicate with my friends and family both online (social networking) and calls or messages.
Not spend as much as some phones last generation, but usually lasts an hour charging period, so for a day, you charge the battery at least twice.