Start by matching the setting and devices you will use, whether you teach in person or online. Focus on a wireless lavalier type that stays out of the way while providing clear voice capture for a teacher microphone set. Consider battery life, connector options (USB-C, AUX, or Lightning), and durability from materials like ABS-plastic or metal-ABS-plastic. If you work with a co teacher, a dual mic kit can be helpful; otherwise a simple plug‑and‑play single mic may be enough. For context, the K9 family and the F11 line offer reliable wireless lavalier options in this category.