DDSY833 type single-phase electronic pre-paid electric meter is developed a new kind product by our company, which is based on excellent of pre-paid special chip. It has multiple functions, such as electrical energy calculaton, load control and user's information management. The product setting carge and adjusting load state in the electric-network. The product can be installed in the electric meter box, indoor or outdoor, the ambient temperature is - 25°C~+60°C.The relative humidity is not more than 85%. Each of performance norms of the product accords with IEC 1036static electric meter international standard and all technical requirements of JB/T8382-1996pre-paid electric meter standard.