I have personally tested the following products and have found that most of them work really well:
The following product was tested in 2012, and it has remained in use since. In the first two pictures, you can see a small "nose cone" that is used to create a "seismic" force when the user leans forward, and in the third picture, you can see the nose cone attached to the top of a small "whip". The main advantage of using this device is that the user can turn very quickly without the need to adjust the angle of the device, and also because the device is lightweight and easy to transport. The device weighs 0.3 oz (9.1 g) and is 1/4″ x 1/4″ (6.4 mm x 6.4 mm). The product has a small battery that will last up to 1 hour. The device was designed to be used with the use of a standard elastic band. However, if the elastic is to small or if the user wishes to change the band style, they can remove the "seismic" force by simply pulling the elastic band off. The device can be used as a "whip" with a standard elastic band to add more force or to create a "nose cone" when a user leans forward.