There is no Heiman brand written on the product itself. The problem with the not branded ones is that they will connect to the zigbee hub, but they don't give a trigger when you press the test button or when there is a fire. So don't buy those. Not safe. Ask a seller before buying if the smoke sensor is branded with the Heiman logo. I have 3 smoke sensors from other sellers with the brand name written on it, en they work perfectly splended! I sadly had to get a refund for this one.
premium material, worked instantly, also with my KAKU ICS2000. will order more for the other rooms in my house.