TIPS- The intercom can be used for up to 48 hours. We recommend keeping the indoor intercom in the charge station after use or charging the indoor machine once every 2 days. And this intercom has a time limit of 60 seconds. PORTABLE- Every intercom comes with a durable clip, it will help you clip the intercom to your shirt pocket, collar, or pants pocket. And it will protect the unit if it is dropped by accident. CUSTOMIZABLE & EASY TO USE- The portable intercom system has 16 channels (1-16) and 4 volume levels (60dB/80dB/100dB/115dB) to adjust. And this home intercom system with clear sound for different application scenarios to use. CAREGIVER INTERCOM- Pregnant women need our considerate care. The intercom system is perfect for them to communicate with others because the intercom system will not produce radiation like cell phones, which can protect the health of pregnant and baby. TWO-WAY INTERCOM- Since the nanny, the caregiver can not always stay with patients or the disabled, what to do when they need help, especially during the night? The intercom is designed for them to ask for help or communication. No need to yell to get someone’s attention anymore.