Attention： Optional purchase package for this product: Single Ear Without Charging Box / Twin ear + charging box Single Ear Package Included: 1*Single Ear without charging Box 1* USB charging cable 1* user manual Double ear with charging box Package Included: 2 x mini Bluetooth Headphones 1 x Charging case 1 x USB Charging Cable 4 * Ear Caps 1 x User Manual Feature: Wireless connection: Bluetooth 5.0 Communication distance:10 meters (accessible open environment) Working Time: about 3 hours Standby time: about 80 hours Single earphone battery capacity: 45mAh Charging box battery capacity: 300mAh Charging box charging time: about 1.5 hours The net weight of a single earphone: about 4.1g. 1. With charging case, can charge earbuds 2. Can automatically Pair, Power on after taking out from the charging case. 3. Wireless stereo left and right channel separation, both ear can be used separately. 4. listening to the song correct, support songs and call.