You can buy the complete KIT or all individual items.
SleepSense Abdomen Effort Kit for NOX
The SleepSense 9011NX Abdomen Cable is compatible with the Nox system and allows for use of an abdominal belt during recording.
The C07-9255-Kit includes:
2 x C07-9255 Reusable Inductive Interface Buckle Set for NOX
1 x C07-9011NX Reusable Abdomen Interface Cable for NOX
20 x C07-9001-L120 Disposable Belts 120cm