The Bluetake BT400GL has a simple rectangular design, with a slight outward curve toward the top to accommodate the curvature of the ear. It measures a very compact 1.53x0.68x0.47 inches and weighs a light 0.29 ounce. The headset's controls are laid out on the front on a vertical bar, with the volume-increase button on top, the multifunction button in the middle, and the volume-decrease button on the bottom. Underneath the multifunction button is an LED, which flashes blue when the headset is activated or blue and red when in pairing mode. The buttons are all raised above the surface, making them easy to press when you're wearing the headset.