The built in speaker in the Bluetooth Ear Hook Speaker is close to the ear but it is not inside the ear, making it easier to listen to your surroundings while on the phone or tuned in at the same time. Portable for business, and safely bike, run, and drive! Built in microphone and external speaker for safety. Single ear ability: either left or right ear. 4-6 hours of continuous play. Mad Man, masters of men's gifts. Material: Acrylic. Dimensions: 3" x 1.5"