features:equipped with new generation bluetooth 5.0 chip, greatly reduces the delay and power consumption, more stable performance, faster transmission speed.it can connect bluetooth quickly when you just open the cover and easy to reconnect with your device.the noise reduction microphone can reduce environmental noise effectively, enable you to enjoy stepped-up clear audio and phone call during business communication.6mm bigger drive unit brings you better bass effect and clear sound quality, makes the sound steady.compatible with both wireless charging and cable charging, less restriction with more ways to maintain long endurance.equipped with three sizes of earplugs, fits the human ear, not easy to fall off, comfortable and painless to wear.small and lightweight, easy to carry, convenient to put in your pockets, bags.it has strong endurance time with low-consumption chip and superior quality battery together, support up to 40 hours using time, no need to worry about power shortage.specification:brand: bluediomodel: ei color: whitestyle: in-earbluetooth version: 5.0transmission distance: up to 10m(barrier-free space)frequency range: 2.4ghz-2.48ghzsupport protocols: a2dp, avrcp, hsp, hfpfrequency response range: 20hz-20khzmusic time in middle volume(fully charged): about 8 hourscontinuous time(fully charged): about 5 hoursstandby time after connecting devices(fully charged): about 100 hoursturn off standby time: about 6875 hoursearbuds charging time: about 1.5 hourscharging case charging time: about 3 hoursbattery capacity: earbuds: 55mah, charging case: 600mahinput voltage/current: 5v/?, 500maoutput power: 7mw+, 7mwpackage size: 13.9 * 8.7 * 4cm /5.47 * 3.43 * 1.57inpackage weight: 109g /3.84ozpacking list:1 * pair of earbuds                                                    3 * pairs of silicone earplugs1 * type-c charging cable1 * user manualequipped with new generation bluetooth 5.0 chip, greatly reduces the delay and power consumption, more stable performance, faster transmission speed.it can connect bluetooth quickly when you just open the cover and easy to reconnect with your device.the noise reduction microphone can reduce environmental noise effectively, enable you to enjoy stepped-up clear audio and phone call during business communication.6mm bigger drive unit brings you better bass effect and clear sound quality, makes the sound steady.