The VTR-912 antenna booster operates on AC power and is a signal amplifier with multiple input terminals. - Model: VTR-312 - Type: Antenna Booster - Power Supply: AC Power - Manufacturer: DX Antenna Co., Ltd. - Connection Terminals: Multiple Input Terminals Thank you for viewing. DX Antenna Co., Ltd. UHF-VHF Band VTR Booster MADE IN JAPAN There are scratches and dirt due to long-term storage. Power-on confirmation (lights up red when plugged into an outlet and turned on) is possible, but video confirmation after removal and connection to a TV has not been performed. Please understand that this is a used item that has been stored for a long time before purchasing. Immediate purchase is welcome.