Inca IWM-121. Device interface: RF Wireless, Movement detection technology: Optical, Purpose: Office. Frequency band: 2.4 GHz, Wireless range: 10 m. Wireless receiver interface: USB, Receiver type: nano. Power source: Batteries, Battery type: AAA, Current consumption: 30 mA. Width: 100 mm, Depth: 60.4 mm, Height: 37 mm