Monitoring of products

An active radio tag for monitoring a product, the active radio tag comprising:

• one or more product state sensors;
• a transmitter for wirelessly transmitting data from the active radio tag to a remote receiver;
• and
• a power supply configured to power the one or more product state sensors and the transmitter;
• and
• one or more processors coupled to the one or more product state sensors and the transmitter and configured to cause the active radio tag to:
• detect, using the one or more product state sensors, one or more of:
• an environmental condition associated with an environment to which the product is subject, and a packaging state of a packaging of the product, and
• transmit, at intervals of time using the transmitter, an advertising data packet to the remote receiver, wherein the advertising data packet comprises a unique identifier for the active radio tag and product state information associated with the detected environmental condition or the detected packaging state;
• wherein the active radio tag is configured to be connected to the packaging of the product.