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Introduction 18  \n1.1 Dimensional Drawings 18  \n2. Requirements 19  \n2.1 Developer Preview 19  \n3. Terminology 20  \n3.1 Device 20  \n3.2 Accessory 20  \n3.3 Component 20  \n3.4 Control Surface 21  \n3.5 Direct User Action 21  \n3.6 Built-In Cable 21  \n3.7 Apple MFi Program 22  \n3.8 Accessory Interface Specification 22  \nAccessories 23  \n4. All Accessories 24  \n4.1 Scratches and Damage 24  \n4.2 Compliance Testing 24  \n4.3 Testing with Apple Beta Software 24  \n4.3.1 Beta Software Access 24  \n4.3.2 Profiles & Logging 24  \n4.3.3 Feedback Assistant 25  \n4.4 USB-B Receptacles 25  \n4.5 User Supplied Cables and AC Power Adapters 25 4.6 TDMA Noise 26  \n4.7 Attachments 26  \n4.8 Magnetic Interference 26  \n4.9 Radio Frequency (RF) Performance 28  \n2026-09-21 | Copyright © 2026 Apple Inc. All Rights Reserved.  \n4.9.1 Materials and Coatings 28  \n4.9.2 Antenna Keep-Out 28  \n4.9.3 Over The Air (OTA) Transmission/Reception 28  \n4.9.4 Specific Absorption Rate (SAR) 29  \n4.9.5 Near Field Communication (NFC) 29  \n4.10 Thermal Management 30  \n4.11 Tripod Connections 31  \n4.12 Anthropometric Considerations 31  \n5. Cases 32  \n5.1 Product Design 32  \n5.1.1 Device Protection 32  \n5.1.2 Access to Inputs and Interconnects 33  \n5.1.3 Dock Compatibility 39  \n5.1.4 Wireless Power 39  \n5.2 Acoustics 39  \n5.2.1 Call Quality 39  \n5.2.2 Speaker to Microphone Coupling 40  \n5.2.3 Speaker/Microphone Openings 40  \n5.3 Ambient Light Sensor and Proximity Sensor 42  \n5.4 Haptics 42  \n5.5 Magnetic Interference 42  \n5.6 Touch ID 43  \n5.7 Camera 43  \n5.7.1 Geometry 43  \n5.7.2 Color 44  \n5.7.3 Surface Finish 44  \n5.7.4 Image Degradation Examples 44  \n5.8 Reliability 45  \n5.8.1 Device Insertion and Removal 45  \n5.8.2 Colorfastness 45  \n5.9 Environmental 45  \n5.10 Verification 46  \n5.10.1 Device Models 46  \n5.10.2 Product Design 69  \n5.10.3 Camera Control 71  \n5.10.4 Haptics 72  \n5.10.5 Touch ID Sensor Overlays 73  \n5.10.6 Camera 73  \n2026-09-21 | Copyright © 2026 Apple Inc. All Rights Reserved.  \n3  \n5.10.7 Near-Field Communication (NFC) 77  \n5.10.8 Compass 78  \n5.10.9 Acoustics 79  \n6. Covers 82  \n6.1 Device Protection 82  \n6.2 Magnetic Interference 82  \n6.3 Smart Covers 82  \n7. Screen Overlays 84  \n7.1 Product Design 84  \n7.1.1 Optical Transmission 84  \n7.1.2 Infrared Transmission 85  \n7.1.3 Transmission Haze 85  \n7.1.4 Coverage 86  \n7.2 Edge Swipe Gestures 86  \n8. Camera Attachments 87  \n8.1 Magnetic Interference 87  \n9. Adapters 88  \n9.1 Headset Adapters (Lightning to 3.5 mm) 88  \n9.2 USB-A/USB-C to Lightning Headset Adapters 88  \n9.3 Lightning to USB Micro-B Adapters 88  \n10. AC Power Adapters 90  \n10.1 Converter Switching Frequencies 90  \n10.2 YCAP AC Capacitor 90  \n10.3 Impedance Stability 90  \n10.4 Fuse Protection 91  \n10.5 Short Circuit Response 92  \n11. Battery Packs 93  \n12. Headsets 94  \n12.1 Product Design 94  \n12.2 Audio Interface 94  \n12.3 Remote Controls 95  \n12.4 Analog Microphone 95  \n12.5 USB-C Headset Identification 95  \n2026-09-21 | Copyright © 2026 Apple Inc. All Rights Reserved.  \n4  \n12.6 Verification 96  \n12.6.1 Product Design 96  \n12.6.2 Headset Plug (3.5 mm) 97  \n12.6.3 Microphone 97  \n12.6.4 Controls 97  \n12.6.5 Audio Quality 98  \n13. Strobes 99  \n14. Keyboards 101  \n14.1 Requirements 101  \n14.2 Examples 106  \n14.2.1 Example HID Report Descriptor 106  \n15. Trackpads 107  \n15.1 Requirements 107  \n15.1.1 Integration with Keyboards 107  \n15.1.2 HID Report Descriptor 107  \n15.1.3 Coexistence 108  \n15.1.4 Performance 108  \n15.1.5 Input Confidence 109  \n15.1.6 Click to Wake 109  \n15.2 Examples 110  \n15.2.1 Example HID Report Descriptor 110  \n15.2.2 Example Trackpad 113  \n16. Braille Displays and Keyboards 116  \n16.1 Requirements 116  \n16.1.1 Braille Keyboards 118  \n16.1.2 Screen Reader Controls 119  \n16.2 Examples 122  \n16.2.1 Example HID Report Descriptor 122  \n17. External Storage 127  \n17.1 Overview 127  \n17.2 Apple ProRes 4K 127  \n17.3 Verification 128  \n17.3.1 A","cbCaidjXWXP0LL9y","https://ap.wps.com/l/cbCaidjXWXP0LL9y","pdf",32775473,404,"English","# Overview\n## Release R31\n# 1. Introduction\n## 1.1 Dimensional Drawings\n# 2. Requirements\n## 2.1 Developer Preview\n# 3. Terminology\n## 3.1 Device\n## 3.2 Accessory\n## 3.3 Component\n## 3.4 Control Surface\n## 3.5 Direct User Action\n## 3.6 Built-In Cable\n## 3.7 Apple MFi Program\n## 3.8 Accessory Interface Specification\n# 4. All Accessories\n## 4.1 Scratches and Damage\n## 4.2 Compliance Testing\n## 4.3 Testing with Apple Beta Software\n## 4.4 USB-B Receptacles\n## 4.5 User Supplied Cables and AC Power Adapters\n## 4.6 TDMA Noise\n## 4.7 Attachments\n## 4.8 Magnetic Interference\n## 4.9 Radio Frequency (RF) Performance\n## 4.10 Thermal Management\n## 4.11 Tripod Connections\n## 4.12 Anthropometric Considerations\n# 5. Cases\n## 5.1 Product Design\n## 5.2 Acoustics\n## 5.3 Ambient Light Sensor and Proximity Sensor\n## 5.4 Haptics\n## 5.5 Magnetic Interference\n## 5.6 Touch ID\n## 5.7 Camera\n## 5.8 Reliability\n## 5.9 Environmental\n## 5.10 Verification\n# 6. Covers\n## 6.1 Device Protection\n## 6.2 Magnetic Interference\n## 6.3 Smart Covers\n# 7. Screen Overlays\n## 7.1 Product Design\n## 7.2 Edge Swipe Gestures\n# 8. Camera Attachments\n## 8.1 Magnetic Interference\n# 9. Adapters\n## 9.1 Headset Adapters (Lightning to 3.5 mm)\n## 9.2 USB-A/USB-C to Lightning Headset Adapters\n## 9.3 Lightning to USB Micro-B Adapters\n# 10. AC Power Adapters\n## 10.1 Converter Switching Frequencies\n## 10.2 YCAP AC Capacitor\n## 10.3 Impedance Stability\n## 10.4 Fuse Protection\n## 10.5 Short Circuit Response\n# 11. Battery Packs\n# 12. Headsets\n## 12.1 Product Design\n## 12.2 Audio Interface\n## 12.3 Remote Controls\n## 12.4 Analog Microphone\n## 12.5 USB-C Headset Identification\n## 12.6 Verification\n# 13. Strobes\n# 14. Keyboards\n## 14.1 Requirements\n## 14.2 Examples\n# 15. Trackpads\n## 15.1 Requirements\n## 15.2 Examples\n# 16. Braille Displays and Keyboards\n## 16.1 Requirements\n## 16.2 Examples\n# 17. External Storage\n## 17.1 Overview\n## 17.2 Apple ProRes 4K\n## 17.3 Verification\n# 18. AirPods Accessories\n## 18.1 Charging Case Covers\n## 18.2 Chargers\n## 18.3 AirPods Max Accessories\n## 18.4 Magnetic Flux Probe\n## 18.5 Verification\n# 19. Apple Vision Pro Cases and Bands\n## 19.1 Apple Vision Pro Storage Cases\n## 19.2 Apple Vision Pro Battery Holders\n## 19.3 Apple Vision Pro Bands\n## 19.4 Verification\n# 20. Spatial Accessories\n## 20.1 Overview\n## 20.2 Product Design\n## 20.3 HID\n## 20.4 Wireless\n## 20.5 IMU\n## 20.6 LED\n## 20.7 USD\n# Contents\n## Overview\n## 1. Introduction\n## 2. Requirements\n## 3. Terminology\n## Accessories","[{\"question\":\"What release is this Accessory Design Guidelines package for?\",\"answer\":\"The document specifies “Release R31” for Apple Devices accessory design guidance.\"},{\"question\":\"Which kinds of compatibility aspects are covered for accessories?\",\"answer\":\"It covers device and accessory terminology, dimensional and product design constraints, compliance testing, RF performance, magnetic interference, thermal management, optical/audio behavior, and verification activities across accessory categories.\"},{\"question\":\"How does the guideline address testing before final compliance?\",\"answer\":\"It includes guidance for compliance testing and testing with Apple beta software, including developer/beta access and profile/logging-related steps.\"}]","Accessory Design Guidelines for Apple Devices - Release R31 | PDF",1791846204,141]