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Built-in lithium battery, which can be using a mobile phone charger. It can be used continuously for 20-30 hours when fully ; Highly sensitive microphone amplification, ALC automatic level control, up to 1000 times amplification, can amplify weak sounds, directly drive headphones for listening, and can be connected to mobile phones for recording, and the interfaces are all 3.5mm; To achieve good results, you need a high-directional microphone. You can make your own or buy one. Please search online.