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Sts Smart GPRS Prepaid Meter. STS Encryption Protocol: Secure data transfer via 20-digit number using STS encryption. Dual Payment Modes: Supports both pre-payment and post-paid mode control. IEC Compliance: Complies with IEC62052-11, IEC62053-21, IEC62053-61, and IEC62055-41. ISO Certifications: Certified under ISO 14001:2004 and ISO9001:2000 standards. High Precision Class: Class 1 accuracy with starting current less than 0.4% Ib. Customized Design: Available as customized prepaid meter for residential usage. Durable Material: Constructed with ABS flame-proof material and IP54 protection.