It is suitable for a small desk clock, bedside table, office; Or a portable battery-powered travel watch. Note: To always display the time on the clock, double press the "Down" button to bring it to standard mode. Set the value to "-: sd" to turn off sound control mode. Recommended to run USB outlets for everyday use. Batteries for back-up or travel use. With the help of LED bulbs, the digital clock consumes more energy and can drain batteries faster.