● Set Contents: Main unit (charger), Sub-units (receivers) x 15, AC adapter, Japanese manual ✴︎ Item ② is missing as the customer took it and hasn't returned it m(_ _)m ● Maximum standby time when sub-units are fully charged: Approximately 50 hours ● Sub-unit charging time: Approximately 8 hours ● Main unit transmission/reception distance: Approximately 200m maximum (The distance extends further in a straight, open area, supporting up to 1000m) It has been implemented in numerous hospitals, clinics, and restaurants as a measure against the three "密" (mitsumitsu) - avoiding crowded places, close contact, and enclosed spaces. You can use it with peace of mind as it has acquired PSE and technical conformity certification. Strong radio waves allow for a transmission/reception distance of 100-200m. Customers in the parking lot can also be called. It can be used for business purposes in various situations and industries.