Yesido Kr21 Usb-C Wireless Lavalier Microphone - Black

Specifications - model: kr21 - material: abs - chipset: ai7131a + ai7187c - frequency range: 2.4 ghz - sampling rate: 48khz / 16-bit - transmission delay: 25 ms - charging voltage: dc 4.8v-5.4v - charging current: type-c 5v/1a (max) - battery capacity: microphone - 90mah; charging case - 750mah (li-polymer) - usage time: approx. 7 hours per charge - charging time: approx. 1.5 hours - microphone sensitivity: -38 dbfs (silicon mic) - working current: 58-65ma - interface: type-c dc5v/1.5a (max)