What is the cheapest fitness bracelet with a programmable vibration motor?

Question

API

There was a need for a device that can be worn on the arm. At the same time, it is necessary to be able to develop software for it that controls the vibration motor. The API must contain at least 3 functions: enable vibration, wait N seconds, disable vibration. No other features are required.
Expensive solutions like Pebble are not suitable because of the price.
Are there similar solutions on the market?

Answer 1

look w3bsit3-dns.com/forum/index.php?showtopic=596501
the price is about $20
there is a version with notifications from local craftsmen. You can send notifications from your application and customize behavior.