Item Type: Digital Audio Power Amplifier Material: ABS Plug: US plug 100-240V Signal Input: RCA gold plated lotus seat signal input Signal Output: 4 wire signal output Input Mode: Analog and Bluetooth input function. Bluetooth input takes priority when inputting in 2 ways at the same time, Bluetooth connection, automatically disconnect the RCA input. analog input is required, please turn off the Bluetooth function of the phone before switching Use: With the sound field and LCD display, can be used for infant behavior hearing, etc. Package List 1 x Digital Power Amplifier 1 x Adapter 1 x Power Cord 1 x Bluetooth Antenna 1 x Instruction 1Audio Performance: Digital amplifier test equipment provides excellent audio performance, enabling users to experience and listen music, which allows for precise power control and error correction. 2High Efficiency: Hearing test equipment is designed with high efficiency and a small, lightweight design, allowing for easy integration and handling. 3Compatible With Visual Reinforcement Equipment: Ideal for use with visual reinforcement audiometry equipment to provide hearing evaluations for individuals wearing sound aids or implants. 4Sound Quality Control: Digital amplifier allows you to adjust the volume and sound quality, ensuring a comfortable and personalized hearing experience. 5ABS: Constructed with ABS material, very hard, with strong impact resistance, scratch resistance, dimensional stability, moisture resistance, corrosion resistance, easy processing.