About delivery:1. We will not put any invoices, QR codes, promotional information in the delivery, so don't worry, just buy, we will do everything for you.2. We guarantee that every device is strictly tested before shipping, so all products are guaranteed 100% high quality before shipping. 100% brand neworiginal3. If you need fast delivery, please contact us, we can arrange priority delivery.thank you very much! ! !If you have any questions, please feel free to contact us and we will reply as soon as possible.Wireless connection: Bluetooth 5.2Net weight of single earphone: about 46gTotal weight with charging case: about 51gTalk time: about 5 hoursBattery life with charging box: about 30 hoursSingle earphone battery capacity: 43mAhHeadphone size: 28*16*21mmCharging box battery capacity: 600mAhCharging box size: 6*42*32mmHeadphone charging time: about 1.5 hoursCommunication distance: 10 meters (barrier-free open environment)Charging time of charging box: about 3 hoursBluetooth protocol: HFP/A2DP/HSP/AVRCP/BLEfeature:*Quick connection: automatic secondary connection, can be used with headphones*Bluetooth 5.2: a new generation of Bluetooth technology, faster and more stable connection*4.6g: comfortable to wear, free to adjust, not easy to fall off*30h long battery life: with charging box, about 15 movies*The principle of sound mixing technology:High-frequency moving iron + low-frequency moving coil, two high-resolution sound units, bring you balanced and full CD-level sound quality*voice controlSummon voice assistant, voice control phonePacking list:Charging case x 1Left earphone x 1Silicone ear tips × 3 (S/M/L)User Manual x 1Type-C charging cable x 1