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2. Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment

	Office premises	47 to 51 years
	Leasehold improvements	over terms of the leases or the useful lives whichever is less
	Furniture, fixtures and office equipment	3 to 5 years
	Motor vehicles	4 years
	Testing equipment	3 years

ZHEJIANG JIAHUAN

Property, Plant and Equipment

	Land use right	50 years
	Buildings	20 years
	Plant and machinery	5 to 20 years
	Office equipment	3 to 10 years
	Motor vehicles	5 to 10 years

ZHEJIANG TIANLAN

Property, Plant and Equipment

	Land use right	Over terms of the leases
	Office premises	47-50 years, with 5% residual value
	Leasehold improvements	over terms of the leases or the useful lives whichever is less, with 5% residual value
	Plant and machineries	5 to 10 years, with 5% residual value
	Furniture, fixtures and office equipment	3 to 5 years, with 5% residual value
	Motor vehicles	1 to 8 years, with 5% residual value