The Singapore Technical Specification for Integated Receiver Decorder defines the requirements for the Integrated Receiver Decoder (IRD) functionality which may be incorporated as a standalone module such as receiver box, an Integrated Digital Television (IDTV) or any other similar device intended for use with the second generation Digital Terrestrial Television broadcasting system (DVB-T2). The requirements for advanced features such as Personal Video Recorders (PVRs) and interactive services are not included in the scope of the Specification.
Quote from page 3 of the Specification:
2 General Requirements
2.1 Power Supply
The DVB-T2 IRD may be AC powered or DC powered. For AC powered equipment, the Specification
shall be complied with when operating from an AC mains supply of voltage, 230V ± 10% and
frequency, 50 Hz ± 2%. Where external power supply is used, e.g. AC adaptor, it shall not affect the
capability of the equipment to meet the Specification.
2.2 Safety Requirements
The DVB-T2 IRD shall be tested for compliance with the International Electrotechnical Commission IEC 60065  safety standards.
2.3 Electromagnetic Compatibility (EMC) Requirements
The DVB-T2 IRD shall comply with §5.3, §5.6 and §5.7 of ISO/IEC CISPR13  or equivalent based
on ISO/IEC CISPR 22 .
That's just a standard for documentation. Just like handphone, what's the point of having the approval/sticker/logo when every traveller can have their own devices in roaming?