1. [5.3] Earphones with 5.3 for fast and stable connection. Low latency gaming mode, precise positioning movement in music mode, with clear vocals and concert effects. 2. [Multi-device connection] These earbuds support multi-point connection, so you can connect them to 2 different devices and then easily switch between them. 3. [Long Battery Life] Headphones provide up to 4 hours of listening time on a single charge. The charging case can hold another 4 to 5 charges, giving you a total of 20 hours of listening time. 4. [ENC Noise Cancellation] These headphones are equipped with ambient noise cancellation to block external noise and ensure a stable sound experience in any situation. 5. [Stylish and Cool] Metal look alloy earphones with stylish design. And comes with a necklace that allows the earbuds to be worn as a necklace. Specification: Item Type:BT Earbud Material: Alloy, ABS, PC BT Version: BT V5.3 BT pairing name: for Rock R3 Transmission distance: approx. 10m Frequency response: 100Hz-20KHz Speaker diameter: approx. 13mm Speaker power: 3mW x 2 Impedance: 32Ω Microphone sensitivity: -42dB 3dB SNR: 95dB Distortion: 3% Charging interface: Type C. Earphone battery capacity: 2 x 30mAh lithium-ion batteries (built-in). Charging case battery capacity: 280mAh lithium-ion battery (built-in) How to use: Connect to BT to use. Packing List:2 x BT Earphones 1 x Charging Case 1 x Type-C Charging Cable 1 x necklace. 1 x user manual (may not English language not guaranteed).