Flexible electronic keyboard with 37 keys - 8 sounds - 6 pre-recorded songs - Recording and playback function - Volume adjustment - Effects: Echo, Sustain - Headphones socket (not supplied) - Power supply: with mains adapter (not supplied) or with cable USB-DC (supplied) to connect to a power bank, PC, phone charger etc. (not supplied) or with 4 1.5V R03/AAA batteries (not supplied)