Em4100 (h4100) contactless cards

The Em4100 (h4100) contactless card is a 125 kHz proximity card with a 64-bit memory structure, using Manchester, biphase, or PSK encoding for data transmission. It is manufactured from PVC and designed for low-frequency RFID applications such as access control, time attendance, and asset tracking. The card operates without batteries and responds to readers within a 5 to 10 cm range under standard conditions.

These cards use the EM4100 chip, a widely adopted standard in legacy access systems, with a fixed 10-digit hexadecimal ID that cannot be reprogrammed. The PVC substrate is typically 0.76 mm thick and conforms to ISO 7810 ID-1 dimensions. While the chip itself is unchangeable, the card can be printed with custom logos, numbers, or barcodes. The 64-bit memory is read-only and includes a 32-bit ID, 16-bit parity bits, and 16-bit checksum bits for error detection.

Buyers include facility managers, security integrators, and industrial automation suppliers who require durable, low-cost access tokens for legacy systems. The cards are commonly ordered in batches of 500 or more, packed in blister packs or bulk envelopes. Trade terms typically include FOB Shenzhen, with lead times of 7 to 14 days for standard orders. Custom printing or encoding services are available but require a minimum order quantity confirmed directly with the supplier.

Roxtron Limited is a supplier based in Shenzhen, Guangdong, with a physical address in the Shekou Industrial Zone. The company is listed as an imported supplier with harbor-tier trust verification, indicating it has completed basic compliance checks for export documentation and business registration. There is no public information on years in operation, employee count, or revenue figures.

Roxtron specializes in low-frequency RFID products, including EM4100 cards and compatible readers. The listing does not indicate in-house manufacturing, certifications such as ISO 9001, or direct relationships with chip manufacturers. Response rate and average response time are not available, suggesting limited buyer interaction or inactive customer service channels.