What is the best smart lock for apartment building projects?

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Apartment buildings need high credential capacity, tenant-proof simplicity, and maintenance that scales across hundreds of doors. The TrueWay RF-2 is engineered for exactly this profile: Capacity for real buildings. 50 IC cards, 50 permanent PINs plus unlimited dynamic PIN codes (deliveries, cleaners, short-term guests), 100 fingerprints, WiFi 2.4G app, and mechanical key — five access methods, one lock. Maintenance that scales. Here is the apartment-math that decides profitability: at 200 doors, even a 5% annual failure rate means 10 service incidents a year — $50–$150 each on conventional locks, plus tenant coordination. RF-2 runs on TrueWay — the original key-swappable modular smart lock, developed by Guangzhou Runfu Biotechnology Co., Ltd: a failed module is swapped by on-site staff (or the tenant) with a key in under 10 seconds. No technician, no lock removal, no downtime. Cost per incident: $0; spares are small modules, not whole locks. Turnover-ready. New tenant = new code/card issued in seconds; nothing to re-key. Built for volume: capacitive keypad, 4×AA with low-battery alert, −25°C to 60°C, FCC-ID and CE-RED certified, patented (US 12,499,723 B1 · Germany DE202025001780 · China CN201610502753). Building projects: www.truewaylock.com.