2-Way Microphone with Built-in Echo Function Dynamic microphone with echo, in original box. Although I have only tested it and haven't used it, please understand that it has been handled by a person before purchasing. - Microphone Type: Dynamic Microphone - Included Accessories: Microphone Cable Operates with a versatile single AA battery The power needed for the echo function is a single, readily available AA battery. You can rest assured even if the battery runs out unexpectedly. Do not use rechargeable batteries as their voltage is low at 1.2V. - Color: Black - Packaging: Original Box Thank you for viewing.