Part Number 600P (SE 3.0) Grothe Mistral 600P, 250m Bell Push / Extender An Additional Bell Push to be used with the Mistral 600 range of chimes. It has internal terminals that transform it into a wired to wirefree extender. This allows a wireless system to be linked to a wired doorbell or to a wired bell push. Also, terminals inside the bell push can be wired to terminals inside Mistral chimes, so that a wireless signal can be extended further to other Mistral chimes. In this mode, it can be used as a signal booster. To Download the pdf of the manual click here :Mistral 600 Manual.pdf Options Additional Plug-in Chime Unit : Click Here [ 400E ] Additional Battery Chime Unit : Click Here [ 600E ] Additional 250m bell push button : Click Here [ 600P ] Additional 500m bell push button: Click Here [ 600PSE ] Optional Period Style Wireless Bell Pushes: Click Here [ Period ] Specifications Dimensions - 12 x 36 x 100mm. (0 .625" x 1.45" x 4"). Batteries, 2 x AAA Type Alkaline batteries (included). Bell Push can be wired to an external 8v - 12v d/c supply. IP54 weatherproof rated for outdoor use. Up to 20 bell pushes can be used with a single chime. Operating frequency, 868.35MHz. This bell push button has internal terminals that allow it to be used as a wired to wirefree extender. This allows a wireless system to be linked to a wired doorbell or to a wired bell push. Terminals inside the bell push can be wired to terminals inside Mistral chimes. The wireless signal can then be extended further to other Mistral chimes. In this mode, it can be used as a signal booster, See Diagram. For 250m select this model, for 500m select the Model 600PSE Both Portrait and Landscape Positioning. The push is opened with an allan key (provided) rather than plastic clips. (clips can snap in cold weather). 250m range (in Open Field and at suitable conditions). Metal Frames , thick walls And UPVC door frames will reduce the operating distance. Optional 500m bell push available. Operating temperature range for all chimes is 0°C to + 30°C. Operating temperature range for all pushes is -10°C to + 40°C.