English to Chinese Marketing Textiles / Clothing / Fashion

关于一款箱包的介绍：
INSPIRATION: very much in line with what the market is asking for
USE: cross-over bag, the most fashionable item of the line, double function: with shoulder strap for the day, without it for the evening
DETAILS: high-quality clasp fastener with a working key mechanism that requires a highly accurate job and industrialization of the product.
The key is in the bell-shaped leather tassel.

working key mechanism如何解释？