Sensitivity Left Front Door Glass Lifter Switch for MercedesBenz W166 Series Upgrade your vehicle's comfort and convenience with this precisionengineered power master window switch. Designed for reliable performance and seamless compatibility, it ensures smooth window control with minimal effort. Key Benefits: sensitivity switch button for quick and accurate response, improving driving comfort and ease of use. Stable performance and reliability for consistent operation in all driving conditions. Long service life thanks to durable, wellcrafted plastic shell that resists damage and wear. Simple installation with no complicated tools required, saving you time and effort. Compatibility: OE Part Number: A1669054400 Fits MercedesBenz models: W166 ML320, ML350, ML400, GL350, GLS450, GLE320, GLE350 Designed for the left front door glass lifter switch group Specifications: Primary material: quality plastic Compact design to fit existing door panel space exactly Built for precise fit and OEMlevel finish Use Scenarios: 1. Quick replacement for a malfunctioning front left window switch to restore seamless window operation. 2. Ideal for upgrading worn or less responsive switches to enhance comfort during daily commuting. 3. Reliable choice for maintaining factorystandard performance in fleet or professional vehicles where consistent operation is essential. This left front door glass lifter switch maintains the original look and feel while delivering dependable control, making it an essential component for both daily drivers and professional automotive servicing.