Dubleup’s power card is a rechargeable external lithium battery offering a convenient way to recharge your electronic devices. Ultra-Light and Ultra-Thin, this portable power supply is an ideal companion for businessmen, students, travelers or for those who use their electronic devices heavily and often require additional power supply. This power card has been made for Apple and Androids and is available in Black, Silver and Gold. It is MFI approved and meets all safety requirements.