IMPORTANT: The AX devices are "not a toy" and it must not be possible for an infant or young person to gain access or interact with a device or band that is not properly secured on the wearer. In particular, the inner sensor puck dimensions are such that it will fit within a "Small Parts Cylinder" that is often used to identify potential choking hazards. It would be advised that any device/band assembly only be used under informed and supervised conditions and you should consider securing with an attachment that cannot be opened without a tool (similar to a hospital identity bands that must be cut off after use), or somehow securely encased within a larger unit that would not pose a choke hazard.