Replace your lost or failed power adapter. This replacement power adapter can provide a power source for any electronic device that has an H type barrel jack & requires 5 volts & up to 2 amps of power. The adapter is a perfect replacement for the lost or damaged power adapter you've used to power your existing electronics. When downtime isn't an option, keeping spare power adapters on hand ensures that you won't be left waiting for a replacement to arrive or have to replace your devices just for the sake of a compatible power source. This power adapter is a direct replacement for the power adapters included with the following Star Tech.com products: Dual-Bay 2.5in Hard Drive Enclosure (S252BU33R); 3-Port Portable USB (Universal Serial Bus) 3.0 Hub plus Gigabit Ethernet (ST3300GU3B); 4 Port Compact Black USB (Universal Serial Bus) 2.0 Hub (ST4202USB); 4 Port Black USB (Universal Serial Bus) 2.0 Hub (ST4202USBGB); 7 Port Compact Black USB (Universal Serial Bus) 2.0 Hub (ST7202USB); 7 Port Black USB (Universal Serial Bus) 2.0 Hub (ST7202USBGB); 15m USB (Universal Serial Bus) 2.0 Active Cable with 4 Port Hub (USB2EXT4P15M); 10m USB (Universal Serial Bus) 3.0 Active Extension Cable (USB3AAEXT10M); 3m USB (Universal Serial Bus) 3.0 Active Extension Cable (USB3AAEXT3M); 5m USB (Universal Serial Bus) 3.0 Active Extension Cable (USB3AAEXT5M); 4K HDMI 4-Port Video Splitter (ST124HD4K); Wireless Display Adapter with HDMI (WIFI2HDMCGE); 4-Port HDMI Automatic Video Switch (VS421HD4K).