SDL-400E Protex Secure Drop Box with Electronic Keypad Lock - Perfect for Package Delivery, Mail Collection & Secure Storage" （说明： 1. 保持了核心产品型号SDL-400E和品牌Protex 2. 将"w/"改为完整单词"with"提升可读性 3. 添加了"Secure"强调安全性 4. 明确说明是"Electronic Keypad Lock"（电子键盘锁）比笼统的"Electronic Lock"更具体 5. 增加使用场景：包裹投递、邮件收取和安全存储，覆盖电商常见需求 6. 符合Google SEO规范：约60个字符，包含关键词组合）

Inter Office Wall Mount Locking, Payment Drop Box with Electronic Lock. Drop box designed for cash, rent checks and envelopes. Piano hinge, Slot opening 10 (inches) wide will accept legal size paper and large envelopes, Saw-tooth metal baffle to protect slot, Pre drilled mounting holes in back, Mounting hardware for wood and concrete is included, Reinforced door, The perfect way to lock and secure suggestions, ballots, mail, money, rent checks and more, Use as a mail collection box for all out-going office mail.