HUAWEI freebuds 5i has cutting edge of fashion, and is 11% lighter than huawei freebuds 4i. High resolution sound with hi res certification delivers crystal clear audio, to tickle your ears as you please. Versatile noise cancellation makes you adapt the effects to the surroundings, such as a busy airport, subway station, restaurant, office, or quiet home, so that you can be heard loud and clear. Up to 28 hours long battery life with a charging case and 4 hours of carefree listening on a 15 minute charge allows you no need to worry when earbuds aren't fully charged. the ldactm transmission protocol needs to be enabled on the playback device connected to the huawei freebuds 5i. Enabling ldac can improve audio quality, while possibly affecting the battery life and causing freezes, depending on the operating environment. noise cancellation may reduce your ability to perceive alarms and alerts in your environment. Please make sure that the ambient environment is safe before enabling this feature. battery life data comes from huawei lab tests. The earbuds can support 28 hours of battery life at a medium volume level when playing audio in aac format, with anc disabled. Actual battery life will vary depending on the volume level, audio source, environmental interference, enabled features, and usage habits. fast charging data comes from huawei labs. Fast charging will only take effect when the battery level of the earbuds is low. The earbuds can provide 4 hours of battery life at a medium volume level when playing audio in aac format, with anc disabled, after being charged for 15 minutes by a charging case with a battery level of over 80% or with a cable. Actual battery life will vary depending on the volume level, audio source, environmental interference, enabled features, and usage habits. huawei freebuds 5i is 11% lighter than huawei freebuds 4i. Data comes from huawei labs. this product is not a professional waterproof device, but is splash resistant during normal use. It has been tested to reach the ip54 level in a lab under controlled conditions. The splash resistance is not permanent, and the protection may decrease with daily wear and tear. Ip54 is only applicable for earbuds, not for charging case.