EXTENDED USE - Provides reliable power for Sennheiser Evolution Wireless D1 SKM handheld transmitters, ensuring prolonged performance during critical recordings and live performances. REDUCE WASTE - This rechargeable battery pack eliminates the need for disposable batteries, offering an eco-friendly and cost-effective power solution for your Sennheiser devices. OPTIMIZED VOLTAGE - Delivers a stable 3.6V output, precisely engineered to match the power requirements of Evolution Wireless D1 SKM transmitters, guaranteeing consistent operation. SEAMLESS INTEGRATION - Designed specifically for Evolution Wireless D1 SKM handheld transmitters, ensuring a perfect fit and reliable connection for uninterrupted audio transmission.