Tech-dat/Network-dat/frequency-dat/frequency-dat.md
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@@ -10,4 +10,54 @@ China has several ISM (Industrial, Scientific, and Medical) bands available for
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- 2.4 GHz: The global 2.4 GHz band is available.
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- 5.8 GHz: The global 5.8 GHz band is also available.
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-For LoRaWAN applications, the 470-510 MHz band is the most significant and widely deployed in China.
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+For LoRaWAN applications, the 470-510 MHz band is the most significant and widely deployed in China.
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+## 🔐 1. Anti-Theft Tags (EAS – Electronic Article Surveillance)
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+These are common in retail stores to prevent theft. They are **not** RFID but use simpler tech.
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+- **Frequency:** **8.2 MHz** (RF system, most common)
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+- **Other types:**
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+ - **58 kHz** (AM system – Acousto-Magnetic)
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+ - **Radio Frequency (RF):** 8.2 MHz
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+ - **Microwave:** 2.45 GHz (rare)
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+
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+---
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+
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+## 📡 2. RFID Tags in Clothing
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+Used for inventory, supply chain, smart fitting rooms, etc.
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+### 🔸 a. **UHF (Ultra High Frequency) RFID**
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+- **Frequency:** **860–960 MHz**
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+- **Most common** in retail for clothing
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+- **Read range:** Up to 10 meters
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+- **Standard:** EPC Gen 2 / ISO 18000-6C
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+
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+### 🔸 b. **HF (High Frequency) RFID**
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+- **Frequency:** **13.56 MHz**
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+- **Used in smart labels, near-field communication (NFC)**
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+- **Read range:** ~10 cm
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+- **Standard:** ISO 14443 or ISO 15693
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+
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+---
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+
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+## ✅ Summary Table
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+| Tag Type | Frequency | Use |
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+|--------------------|---------------|-------------------------------|
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+| EAS RF | 8.2 MHz | Anti-theft (retail) |
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+| EAS AM | 58 kHz | Anti-theft (retail) |
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+| RFID HF | 13.56 MHz | Inventory, NFC, smart tags |
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+| RFID UHF | 860–960 MHz | Inventory, long-range scans |
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+| Microwave RFID | 2.45 GHz | Rare, high-speed systems |
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+---
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+## 👕 In Clothing Retail Today
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+Most clothing stores use:
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+- **EAS RF (8.2 MHz)** for anti-theft
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+- **UHF RFID (860–960 MHz)** for inventory tracking
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