... area),16 or 3 stereo meloy.CE, R&TTE, ROHS,Wireless Doorbell Wireless Doorbell Operating ranges up to 110 meters in the open areaCode ... (mm)Patented: CE, R TTE, ROHSTechnical Parameters of ZTB-292 Wireless Doorbell:Model:ZTB-29(1v2)Transmission range:110m (open area)Packing ...