The BoxBack strap is the accessory for using with BoxBack, the app for punchbags.
Combined with the free BoxBack app, the strap turns your punchbag into a personal trainer.
The strap is available on Amazon for £11.99 (western Europe only) or you can use card payments, through stripe or paypal, to buy it directly for £9.99 (worldwide).
•Simply clips your phone onto almost any punchbag
•Your phone's screen can be operated
•A grippy back to hold your phone in place