Part Number 600TwinC Grothe Mistral 600TwinC, 250m Twin Wall mounted or Freestanding Wireless Chimes Kit The most robust and sophisticated doorbell on the market, with many unique features not available with other wireless products. Both Chime units work from the single bell push button. Unique features below: The chime has an optional distance booster to extend the signal by 250m (Model 600P) or 500m(Model 600PSE) to a 2nd chime. Although the chimes and bell push are normally battery powered, the chimes can be directly powered via an 8 V A/C mains transformer, (Model 7770) and the bell push can be powered by terminals to an external 8v - 12 v DC supply. The bell push button sends the signal 250m, but there is an optional 500m Power Sender bell push. (Model 600PSE) Selectable motifs to change the appearance (or create your own). Extremely robust bell push button with Allen key opening, instead of fragile plastic clips. The 12 glossy motifs below are included in the kit as standard - you do not need to select any at purchase. Just choose one of these, or create your own motif. The motifs are fixed behind a high quality glass look acrylic, with a slightly frosted appearance. Sound Samples (Click Speaker Icon) 3 Tone 2 Tone 2 Tone x 2 Gong 3 Westminster 9 Tone Telephone Alarm Gong 2 Flute Gong, & Bark Symbol Melody 8 Tone Beethoven Welcome Dog Bark 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 - Chimes 175 x 48 x 140mm. (7" x 5.5" X 2" approx). Dimensions - Bell Push 12 x 36 x 100mm. (0 .625" x 1.45" x 4"). Batteries - either 4 x AA, or 4 x C Type Alkaline batteries required. Bell push batteries, 2 x AAA Type Alkaline batteries (included). Chimes can be powered by an 8V a/c, 1 amp mains transformer, instead of batteries. Bell Push can be wired to an external 8v - 12v d/c supply. Front door - back dooroperation , with second bell push button. Bell push, IP54 weatherproof rated for outdoor use. Strobe Light (can be switched off) Sound Level dB@1M, 83db. Colour - 12 Glossy Motifs (included) with silver / black push button. Special alarm function with emergency call tone for special situations No of polyphonic tones available, 17. Comrises 2 chimes and a single bell push button. Up to 20 bell pushes can be used with a single chime. Operating frequency, 868.35MHz. Mute function, and both acoustic and optical, low battery warning indicators. The 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. For 250m select the Model 600P, for 500m select the Model 600PSE Both Wall Mountable or Free Standing. Bell push 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.