Type Sensitivity S/N Ratio Frequency range Speaker Echo cancellation Noise suppression Sampling rate Pick up diameter range Transmission mode Audio output Battery Charge Socket Control Button functions Power Charger Battery Stand by Work Temperature Environment Humidity LXWXHmm Weight Full duplex OMNl-Directional microphone -22dBFS 60dB 20Hz-15kHz Built in powerful speaker, provided AGC excellent audio quality Advanced echo cancellation up to 256ms 15dB 16kHz/48kHzMax 3 Meters, suggest to work in 2 meters diameter distance Wireless prior / USB cable 3.5mm socket for headset Mini USB Button Control or IR Remote control Microphone Mute, Speakerphone Mute, Power on/Off, HiFi mode, VolumeUP/Down DC5V+0.2V1A 2600mA, Talk time up to 10 hours, Fully charged in 5 hours 90 days 0-50℃ 0-95% RH 178mmx 162mmx 47mm 450g (Single)