Features: Intimate mute design, mute when pressing the buttons. 9 channels counting can record and switch nine group data. Large silicone button, more stable pressing and clearer feedback. Ergonomic design, skin friendly, comfortable to hold, non-slip and anti-shedding. Streamlined and ergonomics appearance design with frosted material, outstanding texture, sweat proof silicone ring, comfortable to wear, free sizing, not easy to fall off. Specifications: Material: ABS Size: Approx. 2.2x1.3 for cm/0.87x0.51 in Color: Red/for Grey/Green Battery: 130mA Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Finger Ring