http://www.gison.com.tw/product/gps-304_air_random_orbital_sander.htm

Features:

1. Bearing-Oil Leakage prevention performs longer life.
2. Unique Cylinder-Air-Inlet ensures less maintenance damage.
3. Housing Shroud totally protects housing from dust adhesion.
4. No Spanners Needed when Replacing Pad.
5. 360 degree rotate + 33 degree swivel Exhaust Tube offers wide operating phase. (Vacuum Type)
6. 360 degree Adjust Exhaust Tube (Non-Vacuum Type)


Specifications:

GPS-304N (No Vacuum)
GPS-304C (Central Vacuum)
GPS-304S (Self-Generated Vacuum)
Pad Size: 3", 3-1/2", 5", 6"
Max Speed: 12,000 RPM
Net Weight (No Pad):
0.69 kg (GPS-304N)
0.75 kg (GPS-304C)
0.74 kg (GPS-304S)
Length (No Pad):
160 mm (GPS-304N)
251 mm (GPS-304C)
241 mm (GPS-304S)
Height (No Pad): 86 mm
Air Cons.: 0.27 m3/min (8.3 cfm)
Air Inlet: 1/4"
Hose Size (I.D.): 6.5 mm
Air Pressure: 90 psi
Sound Pressure: 84 dBA
Vibration: < 2.5 m/sec2
Diameter Orbital:
2.5mm (3/32") for Ultra-Fine Sanding
5.0mm (3/16") for General Sanding
7.0mm (9/32") for Aggressive Sanding

http://www.gison.com.tw/product/gps-304_air_random_orbital_sander.htm