Security Key retail price is 20 US dollars, supports FIDO2/WebAuthn standard, uses USB-A interface, weight 3g, very easy to carry. The dongle has no battery and is waterproof. Yubico recommends attaching it to a keychain for everyday use.
Yubico's washing machine can be used for single/double authentication at the same time and supports many services including Facebook, Gmail, Salesforce, GitHub or Dropbox. Yubico said: "FIDO2 and Security Key meet the needs of modernization, flexibility and mobile office in our daily social networking, and provide reliable, portable authentication means. Moreover, these technologies will enter many vertical areas after integration, including Retail, health care, transportation, finance, production, etc."