... IR technology 2. LCD display screen window 3. 11 Activity modules Tech specs of Wireless Conference System IR118 ... 360 degreesPower required2 AAA 1.5 voltBattery life1-2 years with ordinary usageDisplayLCDDimension of LCD:25mm * ... Activity modulesSupport Self-Paced-ResponseButtons: 16, A/1, B/2, C/3, D/4, E/5, F/6, 7, ... program reset featureWeight:0.040kg 2 AAA battery Wireless Conference System