1、Bluetooth V5.1 high‑performance chip, ultra‑low power consumption, intelligent pairing , 2.1Mbps Bluetooth transmission rate, more stable connection signal, and more anti‑interference. 2、The semi‑in‑ear design is light and comfortable, round and compact, ergonomic, comfortable to wear without pain, suitable for exercise. 3、Compatible for iOS and for Android systems, support for mobile phones, for iPads, and for laptops. 4、Smart touch control, multi‑function one‑key operation, bring you more comfortable music enjoyment. 5、Ten protections protect your equipment and your safety, ultra‑low energy consumption, one hour of charging can last a whole day. Item Type: Bluetooth Earphone Material: ABS Bluetooth Version: Bluetooth V5.1 Support Protocol: A2DP1.3 /HFP1.6 /HSP1.2 /AVRCP1.6 /D11.3 Signal Distance: 10~15m Frequency Response Range: 20-20KHz Bluetooth Use Frequency Band: 2.4GHz Charging Interface: Type-C Charging Time: 1 hour Music playing time (full power): 2-3 hours Standby Time: 72 hours Headphone Battery: 30mAh Charging Box Battery: 300mAh How to Use: The Bluetooth name of this product is X19, and the Bluetooth device can be directly paired with audio X19. This product uses smart touch operation. The whole machine has voice prompts. Open the charging box and the headset will automatically turn on, and put the headset in it and the headset will automatically turn off. The headset will automatically shut down after five minutes without connection. 2 x Bluetooth Earphone 1 x Charging Box 1 x USB Cable 1 x Manual