Samson Concert 77 lavalier wireless system features the Samson CT7 belt-pack transmitter along with the Samson LM5 lapel microphons. Samson Concert 77 has a locking P3 input connection as well as a three-segment battery indicator, separate power and audio on/off switches. Samson Concert 77 also features up to 12-hours of battery life on a single 9-volt battery.