This mini electret microphone is perfect for use in various PCB projects. The electret microphone uses a permanently charged material to create a more sensitity which can pick up even the slightest sound. Whether you need to record audio or sound, this electret microphone pickup is the perfect solution. Specifications: Product Name: Electret Condenser Microphones. Color: Silver Tone, Black, Green. Net Weight: 10g/0.35oz. Each Size: 10 x 7mm / 0.4" x 0.27" (D*H). Package Content: 10 x Electret Condenser Microphones. Notes: 1.Please check the specifications and make sure that the size of the electret microphone fits that of your component. 2.Colors in the screen may not accurately reflect the true color due to individual computer monitors differences. 3.Due to the different measure ways or tools, there may exist slight deviation (ranged at 1-3cm), hope you don't mind.