Item information: brand new 100% Volt: 11.1V Rate: 44Wh Capacity: 4000MAh Color: black Compatible Part Number: C31-X402 Compatible for: ASUS: ASUS S400 Series ASUS S400C Series ASUS S400CA Series ASUS S400E Series ASUS VivoBook S300 Series ASUS VivoBook S400 Series ASUS VivoBook S400C Series ASUS VivoBook S400CA Series ASUS VivoBook S400E Series