Battery weight: 4.59 grams. About this product: 【Superior Bluetooth 5.4 Technology】: This Bluetooth adapter is equipped with the latest Bluetooth 5.4 chip, achieving faster and more stable transmission speeds while reducing power consumption. This significantly improves audio and video synchronization during video viewing and gaming, reducing latency and enhancing the entertainment experience. With a transmission range of up to 10 meters, you can enjoy a stable connection anywhere, whether at home, in the office, or outdoors. Note: Once the initial pairing is successful, it will automatically connect when powered on, eliminating the need for re-pairing, making it easy and convenient to use. * Opened but not used. * The product description images from the purchase site are included as is.