keyless

adj.

无键的，转柄上发条的；

Keyless chuck
Keyless Jam Resistance
Keyless entry system for vehicles in particular
Keyless Access Control System Based on Hopping Code Chip MT3108
Key exchange using ‘keyless cryptography’ ☆
Satellite-based keyless remote locking system for vehicle dealerships
Relay Attacks on Passive Keyless Entry and Start Systems in Modern Cars
${\ssr{PriWhisper}}$ : Enabling Keyless Secure Acoustic Communication for Smartphones
Radio-wave transmission system of keyless entry system for automotive vehicle devices
Security-capacity trade-off in large wireless networks using keyless secrecy