269g 2.4G solution: JieLi 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 operating power consumption: (video mode) 25mA Transmitter operating power consumption: (Bluetooth mode) 30-40mA Receiver operating power consumption: 14mA 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: greater than or equal to 10 hours Standby time (off state): 6 months Charging input standard: DC-5V/ Max 200+/-10mA Charging time: 1.5-2 hours