ABS plastic CE certificate 390 inch operating range 32 melodies for your choosein receiver Receiver use 2*1.5V AA Buton use 1*12V 23A battery(include) 1) Suitable for homes, office installed in or outdoors buildings and ships etc. 2) 32 sounds selectable at either transmitter or receiver 3) Transmitter uses 1x12V 23A battery (supplied) 4) 150m operating range 5) Easy to install 6) No electrical wires to install 7) Suitable for Hard of Hearing with Strobe feature 8) Low power consumption note: *Although line of site is not required, the maximum range is based on optimal conditions with minimal interference. Wireless range is affected by objects such as walls, trees, etc. Actual range may vary, depending on environment. Brand No Brand SKU 100350337_NP-1020616559