Filter works by connecting to an air pump (not included)

Specifications:

• QS100A:
  
  Sponge Diameter: 1.89"
  Sponge Height: 3.30"
  Height of Filter Chamber: 1.37"
  Tank Recommendation: 60CM and below
  Filter Chambers: 2
  Filter Chamber Volume: 100ML / 3.38OZ
  Telescopic Tube Length: 7.67 - 10.82
• QS200A:
  
  Sponge Diameter: 2.36"
  Sponge Height: 4.25"
  Height of Filter Chamber: 1.77"
  Tank Recommendation: 60CM and below
  Filter Chambers: 2
  Filter Chamber Volume: 200ML / 6.76OZ
  Telescopic Tube Length: 7.67 - 10.82"