Aputure A.lav Omnidirectional Lavalier Condenser Microphone with 200 Hours Long Working Time, Provides Clean Bright Natural Audio for Stage Performance, Interview, Lecture, Self-Media Recording Small and Portable Omni-Directional Condenser: Provides clean, bright, yet natural reproduction professional-grade audio. All-Time Great Acoustic Fidelity: High signal noise ratio, wide dynamic range, and flat frequency response. Bring broadcast quality sound into your life. Sustained and Stable Electro-Acoustic Work Environment: Built-in lithium and well-designed circuits, aiming to provide a precise and stable reference power. Enhanced Compatibility and Synchronous Monitoring: Well compatible with many devices using 1/8" (3.5mm) TRRS connector. Support IOS and most Android Phones or tablets. However, due to phone setting, some phones like Huawei Honor 6, Mate 7, P8, Sony Z3 etc are not compatible. Unique Multi Indicator: The all-in-one compact design, window-penetrating multifunctional indicator of A.lav keeps you informed of power status. Under normal working state, green light is on; Under charging status, red light is on and it will goes off when fully charged, ensuring work efficiency.