AV STAR (HK) Smart Socket USA Plug 4x4 Outlets + 2 USB Overload Protector with Circuit Breaker for Worldwide Use Vertical power socket use hierarchical design which remedy the horizontal socket's disadvantage of encumbrance Lighting and Overload protector,with 2 USB + 4*4 Outlets Wire core of socket is conformable with international standard, and have overload protector Surge-protected outlets with 1.8m black retractable power cable perfect for your home or office With independent control switch and power light in each layer, use expediently and save power