The Reverso 4 looks and performs almost identically to its predecessor the Reverso 3. That is to say that it is an excellent belay device.
This device can be used for belaying a leader or up to 2 second climbers. The ‘auto blocking’ or Reverso mode (as Petzl call it) allows automatic catching of the second(s) when belaying directly off the anchor from above.
The main differences between the 3 and the 4 are the weight and the larger carabiner holes. You can now put two (average size) locking biners through the top carabiner hole and the release hole now takes most carabiners (with the 3, you could only use smaller carabiners (such as the Petzl Spirit) to release the device after it was loaded and locked up.
Releasing the second: This is an important technique that you should know how to perform.
Catching falls on skinny ropes is easy as the device grabs the rope quickly and securely with minimal force going to the belayers hand.
Belaying and abseiling is smooth so you won’t experience any jerkiness with the Reverso.
The Reverso 4 can be used with 10mm+ rope diameters although you may struggle feeding it through the device.
Petzl recommend using the device with symmetrical locking carabiners (Am’D or WILLIAM) to maximize efficiency.
Ultra-light (59 g) multi-purpose belay/rappel device that regulates the amount of braking friction on the rope according to its diameter and condition; Reverso mode
This multi-purpose belay/rappel device is ultra-light (59 g, 25 % lighter than the REVERSO 3) and intuitive to use. V-shaped friction channels with asymmetrical lateral grooves adapt the friction to the type of rope for better control (ARC technology: braking control for twin, half and single dynamic ropes). Reverso mode for belaying one or two seconds with assisted.
Rope compatibility: for use on half ropes & twin ropes ≥ 7.5 mm and single ropes ≥ 8.9 mm
Material: Hot forged aluminium body.