Wireless Bluetooth 5.0 earbuds with a power bank case. Compatible with Android/iphone /ipad/PC and more devices. The single earbud weighs 4.5 g (0.16 oz), and the ergonomic semi-in-ear design makes you to wear it lightly, comfortably and steady, without falling, you can do sports freely. Each headset can work 4 hours continuously for music or talking which has a built-in 40 mAh battery, and it comes with a 500 mAh charging box that provides 4 times charges, only takes 1.5 hours to be fully charged. T7R earbuds delivers dual calling technology, that provides high-definition calls. It is safer to wear only one headset when you're driving. The earbuds adopts the latest Bluetooth V5.0 chip, which is faster and more stable than the Bluetooth version 4.2 , allowing you to enjoy music faster. The set includes Bluetooth headphones, docking station, micro USB cable, a back cover. Product Specification: Bluetooth Version: 5.0 Frequency range: 2.4 GHz~ 2.48GHz Battery capacity: 40 mAh Charging time: approx. 1.5 hours Music listening/Talking time: approx. 4 hours Standby time: approx. 80 hours Battery box: 500 mAh wEIGHT: 4.5 g single