Symtek TF200 Portable Power Pack for Laptops, Mobile Phones, and Media Players Adds up to 3 extra hours to your laptop's battery or up to 50 extra hours of use-time to your portable electronic devices. Includes tips to work with the following laptops: Apple, Acer, ASUS, Compaq, dell, Fujitsu, TI, HP, IBM/Lenovo, NEC, Sony, Toshiba Charging Time: ~2-3 Hours Low Battery Warning For Laptops, Mobile, PSP and more