Catlog Home (Data Relay & Charger) - Always connected to a power source. - Can register collars for up to 4 cats per unit. (If you have 5 or more cats, please prepare another Home unit.) - Coverage area is approximately 60㎡. (Communication is easily blocked by walls and furniture; we recommend adding more units if there are multiple floors.) - Required environment for use: An internet environment such as a wireless LAN router or mobile router is required.