And so are these twins! Due to their optimal shape, the Twins True Wireless Earbuds always stay in place and feel comfortable. They can be worn with Twins Tip or without silicone earbuds, depending on what is preferred. The Twins are sweat-proof and therefore survive any workout with ease. The earbuds can be used as a pair for stereo sound or individually (Dual Master). Both earbuds have a microphone.