Feature:1. EASY TO USE: 2 way voice intercom support two independent use methods. Press the green key or hold down the PTT key to speak directly, free your hands2. SLIM AND LIGHTWEIGHT: 2 way voice intercom has a thin appearance with a thickness of only 18mm, while similar products on the market have a thickness of more than 22mm3. FINE WORKMANSHIP: The buttons of home intercom system use plastic and silicone structure, the surface use high light UV process, super feel. Compared with peers, the use of all rubber keys, no grade or feel4. BATTERY INFORMATION: Home 2 way voice intercom use 1800mah polymer lithium battery, which work 5 times a day for 30 seconds at a time for about 1 week. Usually put on the charging seat when standby, intelligent charging, never power off5. REMOTE CONTROL: The transmission distance of voice intercom equipment can reach 1000meters in the open area, and can reach 20 to 50 meters through the wall, which is practical, apply to most scenariosSpecification:Item Type: 2 Way Voice IntercomBattery: 1 x Polymer lithium battery 3.7V 1800mAhBattery Power Supply: DC5V 1AOperating Temperature: -20 to 55Transmission Distance: Approx. 1000m / 3280.8ft in open area, 20-100m through wall, 1-8 floorsOperating Frequency: 410-490MHzBattery Life: Approximately 3 days on full chargeCharging Time: Approximately 5 hours to full chargeRingtone: 38 Built in tonesRingtone Volume: 3 Level adjustable(volume button in standby mode)Call Volume: 3 Level adjustable(volume button during call)Product Size: Approx. 116 x 56 x 18mm / 4.57 x 2.2 x 0.71inCharging Dock Size: Approx. 70 x 56 x 29mm / 2.76 x 2.2 x 1.14in.Package List:2 x Indoor Unit2 x Base2 x USB Cable1 x User Manual