Open-Ear DesignThe YJ33 features an open-ear design for a comfortable and awareness-enhancing listening experience. Long Battery LifeEnjoy extended use with a mature standby time of up to 180 days, perfect for infrequent users. Bluetooth 5.4 ConnectivityEquipped with the latest Bluetooth 5.4 technology for stable and efficient wireless connection. High-resolution Driver UnitHiFi Sound ampThree Frequency Balance, large-sized driver,vast sound field, metal plating diaphragm, expressive high analysis, bringing a high frequency of agile and pleasant ears Full Color Smart Screen, Rich Function to ControlFull color touch screen, call to answer, music playback, and the functions such as EQ settings are in control Specifications Model YJ33 Bluetooth Version 5.4 Transmission Range 10-15 meters Charging Time Approximately 2 hours Charging Case Capacity 600mAh Earbuds Battery Capacity 80mAh Standby Time 180 days Charging Port Type-C Frequency Response 20Hz-20KHz