I spoke to the manufacturer of the SY-4KS, it's name in the US is CPRO-2E4KS and it's available from Dino Bozzi @ Globe Electronics, 295 Route 46 West, Fairfield, NJ 07004, (973) 882-9882, (973) 882-9886 - fax.
Cost for the CPRO-2E4KS is $155 plus shipping from NJ.
From the manufacturer.
Hi Thomas,
Please contact Mr. Dino Bozzi below. He will help. And, the model name in the US is CPRO-2E4KS.
If you need further assistance, please let me know.
Thank you,
Chiungfang Hsu
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Cypress Technology Co., LTD.
6F-5,No.130, Jian Kang Rd., Chung Ho Dist., New Taipei City, 23585, Taiwan
Tel: 886-2-2226-9586 ext. 238
Fax: 886-2-2226-9587
Email: chiungfang.hsu@cypress.com.tw
Website: http://en.cypress.com.tw/