Specification: Type: UK Plug Adapter Manufacturer: TESSAN Power on/off Switch: YES Certification: RoHS, CE AC Output Quantity: 12 USB Output Quantity: 3 Rated Power: 3250W max Rated Input: 100V-250V, 13A max USB Output: 5V/2.4A max per port Cable Length: 2M Surge Protection: 900J Product Weight: 710g Product Size: 21 x 13.3 x 10.9 cm Indicator Light: Surge Protected - Red, Grounded - Green About this Product: 15 in 1 Plug Extension Tower: This 12 way multiple plug tower with 3 USB slots can charge up to 15 devices simultaneously without blocking each other, meet various charging needs in your office, home, college dorm room and school supplies etc. Plug Tower with USB Ports: This tower extension lead with USB ports can automatically detect charged devices and deliver optimized charging speed up to 2.4A max per port, ideal for cellphone, tablet, smart watch, earphone, etc. Tower Design with Switch: Vertical design tower power strip takes up little space on your desk, 4 sided design wide space outlet can fit 12 big plug simultaneously, keeping your desk organized and tidy. A master switch control all your electronics. Surge Protected Extension Lead: The power surge protector with 900 joule energy rating safeguards your expensive computers, tv, and other electronices from power surge attacks that might be caused by the unstable power supply, lighting or storm. Stable Base with 4 Non Slip Mats: This tower extension with stable base can support heavy plugs. 4 rubber feet at the bottom keeps it from slipping and sliding,increases stability on table or floor.