2 Way Voice Intercom Super Long Range Wireless Intercomunicador Waterproof Intercom Doorbell System Unit Feature: 1. : The pack contains 2 pcs doorbell system units, which can switch between ringtone call and intercom mode. 2. : the two units can be used as intercomunicador compatible with two way talk without shouting at home. 3. : The transmission distance of the voice intercom device can achieve 1000m in open area and 20 to 50m through wall, highly practical. 4. : The voice intercom units are humanized designed with intercom light and power light, users can see clearly at a glance. 5. : The 2 way voice intercom has built in large capacity battery, adopts intelligent power saving chip, with long battery life. Specification: Item Type: 2 Way Voice Intercom Material: ABS Model: H8 Battery: Rechargeable Lithium Battery 3.7V 1800mAh (Built in) Use: Widely used in household, office, laboratory environment, medical treatment, etc. Basic Parameter: Working Temperature: -20℃ to 55℃ Transmission Distance: 1000m in open area, 20 to 50m through wall Operating Frequency: 410M to 490M How to Use: Install and turn on to use. Package List: 2 x 2 Way Voice Intercom 2 x Base 2 x USB Cable 1 x User Manual