Low cost Subminiature PCB mounting 2 amp Single in-line package (SIP) SSR
• Bottom is approximately 3 times smaller than G3M.
• Low cost “SIP” package switches up to 2A loads.
• Built in Snubber circuit and input resistor as option.
• Two footprints available for design flexibility.
• The G3MB-202PEG-4-DC20MA crosses directly to the Motorola M0C2A-60 series power triac
http://www.sainsonic.com/zen/albums/ebay/nichegeek/20-018-200/05577d01.pdf

Follow this link to discover the dimensions of the arduino boards.
This will help you build your own shields.

http://blog.protoneer.co.nz/arduino-uno-and-mega-dimensions/

We added the updated datasheet of the clap switch kit

check it out here<------------

As I notice a lot of people get confused when they try to build their own schematic. The complexicity in the power input is one of the major problems for the usb power input.So i decide to design a more friendly schematic for those who want to use a 12 power supply only directly.So have a look at this.

08  March 2014 update
Just to inform you that this is a hobby non profit site to help friend expand the knowledge in electronics. I don't make money from the boards and i have already post the pcb layouts and schematics.I have the parts for all the kits.
If someone wants to build one or wants a ready assembly kit i can send him the goods worldwide!