Features: -Suitable for mobile phones, it supports remote short video viewing, likes, page turning, volume adjustment, photo taking, etc. -With 10m Bluetooth 5.3 technology, you can control your phone from anywhere. -Built-in 30mAh rechargeable battery, it can be used for a long time after being fully charged. -With compact body design, it is lightweight and can be easily worn on your finger without causing any disturbance. -It has wide compatibility and is compatible with mainstream apps on the market. Specification: Colour: black Bluetooth: 5.3 Battery capacity: 30mAh Input: DC 5V .