7RYMS Rimo S1 UC Wireless Lavalier Microphone for USB C Phone

Transmitting Power: 10 dBm Dynamic Range: 71 dB Sound Delay: Battery::TX: Built-in Li-ion Battery 95mAh 3.7V Charging Case: Built-in Li-ion Battery 400mAh 3.7V Charging Time::TX: 2 Hours Charging Case: 2 Hours Standby Time: TX: 8 Hours Charging Case: Once Dimension: TX: 45 x 19 x 18.5 mm  RX: 45 x 25 x 8.5 mm Charging Case: 85.5 x 63 x 29 mm