WH-300 Remote Control Alarm 4G Free Call Door Access Wireless Door Opener GSM Gate Opener Relay Switch
High-precision relay switch with industrial-grade PCB for stable signal transmission and extended lifespan. Dual-mode operation via 4G network or remote control, ensuring uninterrupted access even in low-signal areas. Premium ABS housing with IP65 waterproof rating, resistant to extreme weather (-20°C to 60°C). Integrated noise-canceling microphone for crystal-clear free calls between visitor and indoor receiver. Ideal for gated communities, warehouses, and smart homes. Supports multiple remote pairing (up to 50 devices) and auto-lock function with customizable timer (1-60 seconds). Global GSM compatibility (850/900/1800/1900MHz), plug-and-play setup with universal voltage (100-240V). Includes tamper-proof screws and reinforced mounting brackets for anti-theft security. Direct factory pricing with bulk discounts—wholesale orders ship within 24 hours. No middlemen, no hidden fees.