... .Alpha key input .6.Large quantity batteries.7.More functions for your select: Recession, LaySPECIFICATION: ModelDTM112A,DTM112BDTM115A,DTM115BDTM122A,DTM122BDTM125A,DTM125BTelescope ... moduleRemote elevation measurement moduleMemory≥15,000 dotsMeasuring mode Horizontal angleLeft angle, right angle, set modeVertical angleZenith 0°, horizontal 0°, horizontal 0°±90°,slope ...