2 Way Voice Intercom 1000m Long Range Wireless Intercomunicador Wireless Intercom Doorbell System Unit for House HospitalItem Type: 2 Way Wireless IntercomMaterial: ABSWeight: Approx. 319.00g/11.25ozSingle Battery: Li Ion Battery, 2000mAh (Shipped with Built in Battery)Operating Temperature: -20??C to 55??CWireless Distance: 1000m (Unobstructed), 20m to 50m (Obstructed)Wireless Frequency: 410MHz to 490MHz Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!