電子鍵

1. Origins, structure, and basic meaning

• Structure: 電子鍵（でんしかぎ） means an electronic key and combines 電子 with 鍵.
• Basic usage: In the example, 電子鍵をスマートフォンで受け取った describes receiving an electronic key on a smartphone for access to one's lodging.

2. Common pitfalls and similar expressions

• The key's form and function
  • In the smartphone example, think of electronic information used for access rather than a metal key held in the hand. The word 電子鍵 itself, however, does not always specify a smartphone-based method.
• A key versus a lock
  • 電子鍵 is an electronic key used to open a door, while 電子錠 is an electronic locking device attached to a door or similar fixture.