EMPIRE USB Data Cable for T-Mobile Sidekick 4G T839 USB data cable for transfer and syncing with your cell phone. Drivers and software not included. Connect your cell phone with your PC/Laptop by the USB port. Allows to manage & backup your phonebook, and change ring tones/logo etc. Allows you access your contacts, PC data, the internet and e-mail. Transfer rate up to 4 Mbps. EMPIRE(TM) is a registered trademark with the USPTO.