... , C/3, D/4, E/5, F/6, 7, 8, 9, 0, ., <, >, CE, >>>, FnSupport Multi-Correct-OptionsThe signals send and received ... will displayed on the LCDPower required: two 1.5 volt batteriesTransmission distance: > 20 metersTransmission angle> 30 degreeBattery life: > 1 to ... reset support automatic program reset featureWeight:0.040kg 2 AAA battery Wireless Conference System