Feature 1: Wide Application – Wireless intercom doorbells are suitable for homes, hotels, villas, factories, and hospitals. Feature 2: Wireless Range – The barrier-free wireless range is up to 1,000 meters. No internet or wiring required—ready to use right out of the box. Feature 3: Intelligent Design – Features clear LED indicators for intercom status and power, enabling intuitive operation. Feature 4: Battery Life – Both outdoor and indoor units are powered by built-in 2000mAh rechargeable lithium batteries. With average usage (5 presses per day, 2 minutes of talk time each), the outdoor unit lasts approximately 8 months; the indoor unit lasts about 1 week. Feature 5: Advanced Chip – Equipped with a high-performance intercom chip offering strong signal penetration—effective across multiple floors (e.g., 1st to 8th floor). Item Type: Wireless Intercom Doorbell Material: ABS Usage: Homes, hotels, villas, factories, hospitals Outdoor Doorbell: - Battery: 2 x Built-in rechargeable lithium battery (2000mAh) - Operating Temperature: -20°C to 55°C - Wireless Range: Up to 1,000m (barrier-free); 20–50m (with barriers) - Wireless Frequency: 410–490 MHz - Battery Life: Over 8 months (under typical usage) - Waterproof Rating: IP54 - Dimensions: Approx. 121.5 × 61.5 × 31 mm (4.8 × 2.4 × 1.2 in) Indoor Doorbell: - Battery Life: Approximately 1 week (under typical usage) - Waterproof Rating: Not applicable - Dimensions: Approx. 125 × 70 × 56 mm (4.9 × 2.8 × 2.2 in) Package Includes: - 1 × Outdoor Unit - 1 × Indoor Unit - 1 × Charging Base - 1 × DC Charging Cable (for outdoor unit) - 1 × USB-C Charging Cable (for indoor unit) - 1 × Screwdriver - 1 × User Manual Notes: 1. Both indoor and outdoor units include built-in batteries. 2. Avoid placing the product in highly corrosive, excessively humid, or high-temperature environments.