"Our internet-connected devices use a proprietary radio system, which links the alarms together," says Nick Rutter, co-founder and chief executive of FireAngel. The connected alarms can send push notifications to users' phones via their home internet router.
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豫东平原的麦苗刚返青，风里还带着些许寒意。走进河南开封朱仙镇赵庄村，空气的味道却截然不同——那是一股醇厚清冽的松烟墨香，盖过了旷野的寒意，直往人心里钻。