... is a good choice for you: 10m Wireless Operation Distance, Ergonomic Design, High Accuracy, High Quality, FEATURES:100% ... column by column from left to rightLow-voltage alarming function16 wireless working channels, automatic frequency jumpingThe dongle can be stored neatly ... surfaces except glassPlug and play mode, no need driverPowered by: 2 x AAA batteries (not included)Suitable for home, office or ...