Easy to use, the volume can be easily adjusted with the touch of a button, no tools required. Built-in energy-saving rechargeable battery prolongs battery life and extends the time between charges, supporting all-day use. The charging box can be fully charged in 2-3 hours, and after being fully charged, it can achieve an ultra-long standby time of 35-48 hours. Each weighs only 3 grams, which is convenient and comfortable to wear. It comes with earplugs of different sizes to fit everyone's ears perfectly. It adopts a compact and lightweight design, which satisfies your convenience of carrying and invisible wearing, and can be used anytime and anywhere. 【Charging Function】We provide a USB charger to save you the trouble of buying batteries. The device can be easily turned on/off with the power switch. The volume can be easily adjusted by just touching the button, no tools required. And he can be charged anywhere there is a USB socket, such as company computers, home sockets, etc.【Lasting All Day】: It's time to upgrade your products and forget about always running out or replacing batteries. Now, energy-saving rechargeable batteries can provide you with longer battery life and charging intervals. Without having to change batteries all the time, you can freely do what you like【Charging Box】The machine can be fully charged in 2-3 hours, and can reach an ultra-long standby time of 35-48 hours after being fully charged. With the current smaller appearance and compact charging box, it meets your convenient carrying and invisible wear, and can be used anytime, anywhere.【Customized Design】-A single weight is only 3 grams, which is easy to wear. It is simple and comfortable to wear. It comes with earplugs of different sizes to fit everyone's ears perfectly.Specification:Colour: white&goldStyle: in the earPower source: built-in 300mAh batteryEquivalent input noise: 28dB ± 5dBCurrent: ≤ 1.5mAWorking time: ≧20hCharging time: 1.5h Package Included:2x Sound amplifiers1x Charging box1x Charging cable1x Instruction manual2x Packs of accessories