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 hands 2. 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 22mm 3. 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 feel 4. 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 off 5. 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 scenarios Specification: Item Type: 2 Way Voice Intercom Battery: 1 x Polymer lithium battery 3.7V 1800mAh Battery Power Supply: DC5V 1A Operating Temperature: -20℃ to 55℃ Transmission Distance: Approx. 1000m / 3280.8ft in open area, 20-100m through wall, 1-8 floors Operating Frequency: 410-490MHz Battery Life: Approximately 3 days on full charge Charging Time: Approximately 5 hours to full charge Ringtone: 38 Built in tones Ringtone 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 0.71in Charging Dock Size: Approx. 70 x 56 x 29mm / 2.76 x 2.2 x 1.14in. Package List: 2 x Indoor Unit 2 x Base 2 x USB Cable 1 x User Manual