Mono LED VU meter Sound Meter Level Indicator + Microphone Preamplifier HK1523 This is a single function indicator designed with discrete elements. The circuitry consists of a level indicator for low frequency signals. The LED indicator is mono type. Dot bar type. Input signal - electret microphone (included). Input level control - trimmer-potentiometer. 12 LEDs. Supply voltage DC - 12 to 15V (max 120mA), (You can use the car battery). Overall dimensions PCB 105 x 37mm (4.13" x 1.45"). Overall dimensions PCB microphone amplifier 31 x 22mm (1.22" x 0.86"). This item Fully assembled (ready built), look pictures. This price for one piece. Package Content: - 100% Brand New in original packing. - English Instruction Manual. - 1x Mono LED VU meter Sound Meter Level Indicator + Microphone Preamplifier HK1523. Shipping: - All items will be checked before packing. All items are new and of high quality. - We will ship within 1-3 business days upon receipt of payment, excluding weekends and public holidays. - We only send by registered mail or courier, with tracking number. - Delivery time is from 5 to 30 business days depending on the destination. Customer Services: - Please contact us, we will assist you in any way possible and aim to answer all emails within 24 to 48 hours.