So tiny, the pump is barely larger than a quarter.
Compatible to PeakTop 303 Pump

Click on the More Images to view this pump enhanced.

Pump's Specs: 1-1/4" wide ~ 1-1/2" Long ~ 1" tall not including the adapter (spout)

• GPH: 40
• Max Rise: 14"
• Suction Cup Feet: Yes
• Submersible: Yes
• Water Flow Adjustable: Yes H-M-L
• Low Voltage: Yes
• Pump's output: AC~60Hz~2W
• Tubing Size: 7/16" OD x 5/16" ID 
• Quiet: Yes

Male/Female connection to the included transformer as shown in the More Images photo above

Transformer: 2-1/4" Length ~ 1-1/4" Wide ~ 1-1/4" Deep
Electrical Specs: Class 2
Input: 120V ~ AC/AC 60Hz ~ 3.9W
Output: 12VAC ~ 200mA