Singing rock descender. No need to unclip the device for rope insertion. By pulling the lever the cam gradually releases the rope. Also suitable for work at a height and for emergency self evacuation. Robust multipurpose device. For safe ascent and descend in the vertical world, SINGING ROCK offers a range of descenders which meet the relevant legislative requirements of the European Union, as well as the requirements of the US market (CE, NFPA, ANSI). It's functionality spans the range from rope descender and abseiling device through semiautomatic belay and fall-arrest device. 4 Be the first to review this product $189. . Descender with anti-panic system in case of accidental loss of descent control the descender doesn’t have movable flanges; this makes it a robust and mistake-resilient device (quick insertion and release, no need to unclip it for rope insertion) Descender with double locking and anti-panic system: self braking in case of accidental loss of descent control. SINGING ROCK LIFT HAND ASCENDERS 2 Reviews Starting at $69.