Acme plastic working dog whistle with key ring attachment.  Approx. 10cm in length.
 
Pitch:

- 210 (Ultra High pitch with cork)
- 210.5 (High pitch without cork. Produces a solid tone with a single high frequency)
- 211.5 (Standard pitch without cork.  Solid tone and single frequency)

REF: AC210.5/211.5/210