Compact structure, like a broad bean in your hand Side flat ear hidden design, not flashing when used Mini invisible headphones,It can be worn on both sides, and you can switch songs! Small enough, light enough, invisible wear as comfortable as nothing, easily hidden in your ears. Built-in 55mAh large capacity battery, combined with energy-saving circuit and high-performance low-power chip Fully charged for 3 hours of continuous listening to musicor 3 hours telephone conversation IP66 waterproof , all-round waterproofing function, multi-function and strict design, without fear of heavy rain or sweat. Specification: Model:x20 Size:92 x 92 x 31mm/3.6x 3.6 x 1.2 inch Bluetooth version: V5.0 Headphone capacity: 55MAH Charging Case Capacity: 260MAH Transmission distance: 5-10 meters Talk time: 3 hours Music time: 3 hours Standby time: 80 hours Package Includes: 1x Wireless Headset 1x USB Cable Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.