While the included short strap is ideal for the back of the knee or leg, it is not useable for the back. Use the longer strap or the following method which is an an alternate way of holding the device.
Buy your Sciaticalm from only £44.95
(pharmacy price RRP £49.99 inc VAT)
Sciaticalm units are UK manufactured and shipped
daily from Southampton.
A 10 page, illustrated guide to sciatica and lower back pain which will help you understand the condition and manage your pain.