Thank you for viewing our products! This is the latest model with no complicated operations. The earphones automatically remember the smartphone you connected to once, and for subsequent pairings, they automatically connect to the device in 3 seconds. These Bluetooth earphones are compatible with various Bluetooth-enabled devices, including iPhones, Android smartphones such as those from docomo, and tablets. * Continuous playback time is approximately 1.5 to 2 hours, although it may vary depending on the volume. * Playback is in mono. * A charging cable is not included. Thank you!