If you are referring to the DJI Mic (the most popular professional "mini" mic), here are the key specifications:
• Transmission Range: Up to 250 meters (820 feet).
• Battery Life: 5.5 hours per transmitter/receiver (up to 15–18 hours with the charging case).
• Internal Storage: 8GB (stores up to 14 hours of 24-bit lossless audio).
• Connectivity: USB-C, Lightning (iPhone), and 3.5mm TRS (Cameras).
• Audio Quality: 24-bit (DJI Mic) or 32-bit float internal recording (DJI Mic 2).
• Weight: Approximately 30g per unit.
• Dual Channel: Supports two transmitters recording at the same time.
If you meant a generic "mini microphone" for DJs or phones:
• Type: Omnidirectional Condenser.
• Plug: 3.5mm Jack or Type-C.
• Sensitivity: -30dB +/- 3dB.
• Frequency Range: 20Hz - 16kHz.