The Slim & Clear is a digital audio monitor set from Summer Infant. Its designed to give you peace of mind and keep you connected to your little one. The set has 2 parent units for easy monitoring from different rooms or by 2 different people at a time. This Summer Slim and Clear monitor also has a baby unit with a status light indicator. The portable units employ a 2.4 GHz frequency range for transmitting static-free and secure signals. They work at a range of up to 600". These units have visual sound lights that glow depending on the sound level in the nursery. The baby audio monitor is powered by a rechargeable lithium-ion battery. The parent units come with a belt clip, low battery indicator and out-of-range indicator for added convenience.