New generation Bluetooth 4. 0 for versatile wireless connectivity The USB-BT400 is a Bluetooth Smart Ready USB adapter with new Bluetooth 4. 0 capabilities. It connects you with a multitude of compatible devices and supports Bluetooth Low Energy (BLE) to reduce power consumption. In dual-mode, the USB-BT400 maintains full backward compatibility with Bluetooth 3. 0, 2. 1, and 2. 0. Get Bluetooth 4. 0 and connect with multiple devices The ASUS USB-BT400 provides new and advanced Bluetooth 4. 0 and enables wireless connectivity with a wide range of devices such as computers, printers, phones, headsets, speakers, keyboards, controllers, and more. In addition, the ultra-small USB-BT400 comes with Bluetooth Low Energy (BLE) technology, which lets you enjoy energy-saving connectivity.