TURNSTILLE - Half Height Turnstille
EQ-501

Sunx infrared transceiver
Comes with transmitter and receiver built into a single unit.  Adjustable range 0.2 to 2.5 meter.  Relay contact output.  20 msec response time.

Can be installed onto to turnstile as additional security protection to prevent people from crawling under or climbing over the turnstile.