specification: Product name: Mini microphone Material: aluminum alloy Purpose: Singing on mobile phone; network recording Suitable for: most mobile phones, computers, tablets, etc. Condenser microphone unidirectional Frequency response range: 30HZ~20KHZ Output impedance: <200Ω Sensitivity: -30dB +/- 3db (0dB = 1V / PA AT 1KHZ) Power supply: 3V Interface: 3.5M (used with any device equipped with 3.5mm) Cable length: ~1.5M package: 1 * Mini microphone 1 * Sponge cover 1 * Durable metal box