Size: 4.3 x 4.7 x 1.3cm Chip: Professional 2.4GHz wireless microphone chip Control method: Button Active and passive: Active 2.4G solution: Jerry AD6976M4 Working system: GFSK Working frequency: 2.4G-2.4835GHZ Radio sensitivity: -38db Effective distance: Greater than or equal to 10 meters Transmitter shutdown power consumption: 2ua Transmitter power consumption (video mode): 25ma Transmitter power consumption (Bluetooth mode): 30-40ma Receiver power consumption: 16ma Receiver charging current for mobile phone: 1000ma Microphone signal-to-noise ratio: Greater than or equal to 65db Frequency response: 20Hz-20KHz Monitoring: One-way monitoring Microphone: Electret Battery: 300mAh Talk time: More than 10 hours Standby time: (off state): 6 months Charging input standard: DC-5V/MAX 200+/-10mA Charging time: 1.5-2 hours