The AP2718AT is a MEMS (Micro-Electro Mechanical System) microphone manufactured by Quan Li that features omnidirectional -42 dB 220 O 57 dB SMD-4P, 1.9x2.8mm in size. It has been designed for a wide variety of applications such as telephony, speech recognition, audio recording, and more. Its small size and low-profile design make it ideal for embedding in products or applications where space is at a premium. It is manufactured to meet RoHS standards and is guaranteed to provide reliable performance.