This is usually done by changing a Setting on the mobile handset. A telephone headset functions by replacing the handset of a telephone. Headsets provide the equivalent functionality of a telephone handset but with handsfree operation. Some of these adapters also provide mute function and switching between handset and headset. Headsets provide the equivalent functionality of a telephone handset with hands-free operation. The handset supports VOOC 3.0 flash charging technology. Both the SIM card and the handset can be tracked. RED is fully touch-screen and handset controlled. The company will then provide the unlock code for the handset. The alliance is seen as a competitor to other groups like Android's Open Handset Alliance. An acoustic coupler for a then-standard telephone handset was also available. It can also shrink any images to fit as the handset screen. The connector on the Amiga 1000 used crossover wiring, similar to a telephone handset. In 2003, the Nokia 1100 handset was launched. The electronic sensor transmits an RF signal to a base handset.