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Tech specs of RF217 Classroom Reply Systemsare as follows: General specs, 1. 2.4GHz digital RF technology 2. 4 radios channels 3.Two-way, never jam, never lost 4.High Speed - 100 audience keypads transmission < ONE second (similar products may require 5 seconds or more). 5.Super-Wide-angle signal transmission: 360 degrees angle 6.ID number changeable (compare to the obsolete ID setting mode of similar products), No need to keep a large stock of student remote. (For resellers) 7.Up to 100 meters transmission and reception distance 8.Support cascade and uplink option 9.Support up to 3000 audience keypads 10.Easy to install, easy to use 11.Plug-in software of MS PowerPoint 12.Support self-paced answering 13.Multifunctional instructor remote 14.USB port or 232 port connection 15.Third party software supportable 16.OEM or ODM acceptable About software, 1. 5 language versions: Chinese simple, Chinese traditional, English, Spanish, Hungarian. 2.PowerPoint plug-in, easy to learn and use, for the PowerPoint is familiar to many people. 3.Provides 10 kinds of activity-models for interactive teaching and meeting 4.Professional statistics analysis engine, automatically produce 10 kinds of reports tracking and recording the process of the activities 5.Colorful and multiform multimedia questions 6.Flexible data transformation, analysis results can be presented in html and txt formats. 7.Statistics data can be exported as xls format 8.Prompt diagnosis of teaching effectiveness and improve teaching process 9/Supports oral, blackboard or paper-based questions 10.Auto-recognize function, no need transform of the used PPT slides 11.Auto-setting question and options About instructor remote, 1.LED status 2. 4 radios channels 3.Laser indicator build-in 4.Power required: two 1.5 volt batteries 5.Transmission distance: > 100 meters 6.Transmission angle: 360 degree 7.Battery life: > 1 year for ordinary use 8.Durable and not easily breakable, will not break or damage even drop to the cement ground from 5 meters high 9.Easy to use 10.Maintain full control over every presentation 11.Present slides, going backwards, forwards, showing charts etc. 12.Select a user at random to answer a question 13.Control games procession. 14.Over 1 year battery life for normal use. 15.It will enter Power Saving Mode within 5 seconds when is left idle 16.It's clipper-built, small and exquisite, very suitable for handhold Aboutaudience remote, 1.LED status: green and red 2. 4 radios channels 3. 11 Activity modules 4.Support Self-Paced-Response 5.ID Address Programmable 6.Power required: two 1.5 volt batteries 7.Transmission distance: > 100 meters 8.Transmission angle: 360 degree 9.Battery life: > 1 to 2 years for ordinary use 10.Support fast-ID setup function 11.Durable and not easily breakable, will not break or damage even drop to the cement ground from 5 meters high 12.Easy to use 13.Up to 400 remote controllers can be used at once (enhanced version can supports 3000) 14.WDT reset support automatic program reset feature About receiver, 1. 2.4GHz digital RF technology 2. 4 radios channels 3.Color: black, opaque 4.Port: USB port or 232 port 5.Weight: 0.4kg 6.Operating Temperature: 0-40 degree 7.Power required: DC12V, 800MA adapter or no extra power required 8.Operating Relative Humidity: 0-90% 9.Operating Power: <1mw 10.Receiving angle: 360 degree 11.Receiving distance: 100 meters radial 12.High processing speed - 400 audience keypads' transmission <3 second 13.Support up to 400 student keypads (enhanced version can supports 3000) 14.Easy to install - use one RJ-45 cable for data & power