Features:

• Brand new and high quality.
• Part No. TR-35.
• Professional, high Class.
• dB : -20~+5dB.
• 0dB=1.288V+/-10%, calibalated.
• DCR= 650Ω, If=450uA.
• Lamp : White LED/AC bulb x1pcs ,10~20mA (has no resistor inside).
• Led Lamp/AC bulb voltage voltage : 2.2~2.6V.
• So, you need the resistor :270Ω 1/4W ,if VDC=5V.
• 390Ω 1/4W ,if VAC/DC=6.3V.
• 1000Ω 1/2W ,if VAC/DC=12.6V.
• need external resistor,diode, capacitor.
• (if 1Khz 0dB=1.288Vrms,R1=470Ω,VR1=100Ω, or R1+VR1=500Ω).
• Dimension : 35.0x35.0x38.0mm, WxHxD.
• View size : φ34.0mm.
• Mounting hole/pitch : φ3.5mm/28.0x28.0mm.
• size:3.7cm x 3.5cm X 3.5cm - 1.46inch x 1.38inch x 1.38inch.