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    Wireless Voice Intercom Super Long Range Wireless Doorbell 2-Way Audio Intercomunicador Waterproof Intercom Doorbell Unlock Door Key Features: Wireless Audio Intercom Doorbell for Villa apartment, factory, office, warehouse 1. Wireless intercom doorbell, no wiring, no network required, built-in wireless signal, two-way intercom, hands free, supports wireless remote unlocking. 2.Doorbell device transmission adopts 433MHz public channel, with long transmission distance and strong penetration (about 800~1000 meters in open space, 1~6 floors indoors) 3.18650 battery powered, low-power consumption, ultra-long standby time. 4.Wireless unlocking box design(optional), The indoor Receiver can wirelessly connect to the unlocking box. Realize one-button unlocking. 5.Outdoor doorbell Transmitter and indoor Receiver support two-way intercom 6.Wireless doorbell with 38 polyphonic ringtones, Ring volume adjustment 7.Outdoor doorbell has IP55 protection level, which can work normally in rainy and snowy weather. Specifications: Outdoor Doorbell 1.Power supply: Built-in 18650 lithium-ion battery (1200mA)2. Two charging ways: Type-C port and two-pin terminal. 3.Support solar charging (optional) 4. Standby time: ≥ 260 days (1200mA battery) 5. IP55 waterproofing grade 6. Wireless hands-free two-way intercom 7.One click call, LED indicator, call busy tone 8.LED ：low battery power reminder and charging indication 9.Each system group can support up to 5 devices (Random matching indoor and outdoor units) and multiple wireless unlocking devices 10.Installation: fix on wall by screws or 3M adhesive fixation Indoor Unit 1. Power supply: DC5V lithium battery 18650 (1200mA) 2. Wireless charging base design, convenient and artistic 3. Type-C charging port 4. Standby time: ≥ 50 days (1200mA battery) 5. Wireless hands-free intercom 6. Wireless unlocking 7. Support internal calls (Max. 5 indoor units) 8. 38 polyphonic ringtones, one click cycle selection 9. Ring volume adjustment 10. LED calling, intercom, unlock, low battery power indication 11. Installation: Portable or put on desk, flexible application scenarios   Wireless unlocking box (optional) 1.Power supply: DC5~35V 2.One button unlocking 3.Mode selection: Normally open or normally closed 4.Unlock holding time: 3S, 6S, 8S adjustable 5.Supports up to 10 controllers (Outdoor unit, remote controllers) 6.Adapted lock types: electric control lock, magnetic lock