Sennheiser EW D1-835S Evolution Wireless D1 Digital Vocal System with Handheld Microphone E835 Dynamic Cardioid Capsule Simple - ew D1 automatically configures itself to deliver great sound. Focus on your performance, not on your gear! Powerful - ew D1 automatically scans and selects the best frequency for operation. If interference is detected, D1 seamlessly moves to a new channel. Reliable - "Wireless link protection" eliminates signal dropouts by continuously adjusting its transmission power and channel selection. Detailed - crystal clear digital sound, featuring the renowned aptX Live codec. ew D1 offers wide frequency response, great dynamics and low latency Durable - Rugged, all metal construction, backed up by comprehensive 2 year warranty when purchased from an authorized Sennheiser dealer!