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In perfect working order. The MXR M87 Bass Compressor is an analog studio-style compression stompbox featuring Constant Headroom Technology (CHT) and full parameter controls in a compact Phase 90-sized enclosure. You can explore official details on the Dunlop Product Page. ControlsInput: Sets the signal level hitting the compressor to determine the compression threshold. Output: Adjusts the makeup gain for your output volume level. Attack: Controls how fast the compressor clamps down, ranging from 20 µs to 800 µs. Release: Controls how quickly the compression lets go, ranging from 50 ms to 1.1 s. Ratio: A rotary or toggle switch offering 4:1, 8:1, 12:1, and 20:1 (where 20:1 acts as a hard limiter). Meter Display: A 10-segment LED gain-reduction meter that visually tracks your compression activity. Technical SpecificationsInput Impedance: 1 MΩOutput Impedance: 600 ΩMax Input: +14 dBVMax Output: +8.5 to +9.2 dBVFrequency Response: 20 Hz to 20 kHzMax Gain: 31 dBBypass: True hardwire bypassPower Requirements: 9V DC center negative adapter or a 9V battery (current draw: ~14 mA with LEDs off, ~19 mA with LEDs on, ~6 mA in bypass)Dimensions: Approx. 2.12" x 2.62" x 4.37" (5.9 cm x 11 cm x 4.7 cm including knobs)Weight: Approx. 0.56 lbs (239 g)