· Bluetooth version: V4.1 · Support profile: Hands Free1.6, Headset 1.1, A2DP · · AVRCP 1.5. · Bluetooth distance: 10 meters · Continuous call duration: about 3 hours · Standby time: about 100 hours. · External charging voltage: DC 4.8V-5.2V · Incoming Call, voice prompts.With status indicator. · One for two：One Bluetooth earbuds can connect two mobile phone. · Automatically re-connect function. · Energy saving , Automatically shut down after 5 minutes without connection . · Smart Voice assistant control, Cancel Bluetooth connection function