Kaidike CSR4.1 Running In-ear Universal Bluetooth Sports Headset Product description: True wireless earbuds HiFi high-fidelity sound quality: True wireless stereo, using the latest Bluetooth 5 technology and the most advanced acoustic components, can produce incredible sound quality, clear bass and treble. Enhanced stable connection and easy automatic pairing: The upgraded Bluetooth 4.1 provides a stable connection without losing calls and music. No need to worry about walking away or losing the connection. Simply remove the Bluetooth earbuds from the charging box to enter the pairing mode without using troublesome tricks. Automatically reconnect to the phone after initial pairing. Safe fit and mini design: ultra-lightweight, mini in-ear design, multiple sizes of earplugs can block outside noise, ensure that the headset stays comfortable and fixed, and improve the exercise and exercise experience. Longer enjoyment: 4-5 hours on a single charge, 6 hours of music time, and 7.5 hours of talk time. Wide compatibility: compatible with iPhone XS XR X 8 7 6 Plus, iPod Shuffle, iPod nano, Android, Samsung Galaxy, BlackBerry, HTC, iPad Pro, Bluetooth-enabled phones and tablets; very suitable for sports, exercise, running, Jogging, working out in the gym, audio books, watching TV or sleeping Battery capacity: Bluetooth name: BT-KDK06 Bluetooth version: v4.1 Transmission distance: 10M Battery capacity: 100mah Products include 1x Bluetooth headset 1x Charging line