It had NO circuit diagram - or any details. just the small cct board and chip. ANy email sent to company bounces! They sent Norwegian mail to me???

The Arduino Playground site discusses this board under the MPU-6050 page, scroll down to the GY-521 section at http://playground.arduino.cc/Main/MPU-6050.

Does this use the same chip as that sold by Sparkfun and Digikey? If "yes", how can it be so cheap? Other places seem to sell just the chip for $14.

Sparkfun is renown for their massive mark ups, never use them for price comparison. Digikey is much better, but there is still a bit of a mark up. As of this comment, they are charging $5 per chip if purchased in bulk and $10 for individual chip. Chances are, this chip is legit but the board is Chinese made.

Is there any need to add a logic shifter for the sda and scl pin coming from my arduino mega.... my arduino mega is delivering about 4.18v

Nope, no Logic voltage shift needed.

Can you tell me the voltage output? I'm wondering if I could connect this directly to an IR Blaster. Thank you.

Spec sheet for the IC is here ( http://www.invensense.com/mems/gyro/documents/PS-MPU-6000A-00v3.4.pdf ), and it looks like this board has a linear regulator to let the 3.3V chip be supplied from 5V. So it looks like the outputs are at 3.3V. If that's the voltage of your IR blaster and the protocols are compatible, sure. If you're looking to use the 'Digital Motion Processor', you'll need to figure out how to program it -- I never took the time to.

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Specifications

Brand	REES52
Item dimensions L x W x H	1 x 1 x 1 inches
Style	Modern
Maximum Supply Voltage	5 Volts (DC)
Measurement Accuracy	High
Measuring Range	Gyroscope: ± 250, 500, 1000, 2000 °/s; Accelerometer: ± 2, ± 4, ± 8, ± 16g
Mounting Type	Flange Mount
Output Type	Digital
Specific Uses For Product	personal
Upper Temperature Rating	85 Degrees Celsius
UPC	692011914492
Global Trade Identification Number	00692011914492
Manufacturer	BlastCase
Item model number	REES-01
Item Weight	0.352 ounces
Product Dimensions	1 x 1 x 1 inches
Item Dimensions LxWxH	1 x 1 x 1 inches
Voltage	5 Volts
ASIN	B008BOPN40
Is Discontinued By Manufacturer	Yes
Date First Available	June 15, 2012