The strap weighs just 40g (1 oz) and is just 12.5cm (5 in) long. Yet it can store up to 40 minutes of call time once fully charged.
Just one problem … it takes 6-10 hours to charge in perfect weather conditions.
The solution…let the strap hang out of your pocket or bag and walk around outside all day. Or, you can just plug the dang thing in every night to keep it charged.
Price – Y1,995 ($20)