Dear Sir MadamWe are looking for a manufacture of optical sensor (chips).Solar (chips)outnsions are as follows: 1. 5mm x 5mm; 2. 2.5mm x 5mm. Annual demand of the optical sensor would be about 1.000.000 pcs of each. Continuous of usage should be 5-7 years. If you are interested in producing these let us know and we will send you requirements for the .