Hagen Multi-Vac Battery Powered Vacuum. 

Provides the convenience of a cordless 
cleaner/siphon. 
Battery powered ... eliminates risk of 
electric shock. 
Requires 2 "C" batteries (not included). 
Performs 3 functions 
1) Gravel Cleaner 
2) Water siphon 
3) Algae cleaner 
Extendable - from 20cm -40cm ( 8" - 16") 
Vacuum bag collects all debris.