The description of different chips are as follows:
HQ:
Resolution: 520TVL
PAL: 752 x 582 pixels
NTSC: 768 x 494 pixels
Current: 1,000mA
Minimum illumination of 0.4 Lux/F1.2.
STH:
Image sensor: 1/3-inch Sony
Resolution: 480TVL
PAL: 752 x 582 pixels
NTSC: 768 x 494 pixels
Current: 1,000mA
Minimum illumination: 0.5 Lux/F1.2
STL:
Image sensor: 1/3-inch Sony
Resolution: 420TVL
PAL: 500 x 582 pixels
NTSC: 510 x 492 pixels
Current: 1,000mA
Minimum illumination: 0.8 Lux/F1.2
AGC: on/off
Gamma characteristic: above 0.45
White balance: auto
Backlight compensation: on/off
S/N ratio: greater than 48dB
Power supply: 12V DC
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