Serve frequency: the number of serves is about 15 per minute, and the service machine serves once every 4-6 seconds. The number of balls can be loaded: 15 balls for normal use (no table tennis balls). : 4 AA (you need to bring your own battery). PE material, long service life, more durable, simple and easy to learn, suitable for all kinds of people. Angle of drop: . - PE material, long service life, more durable, simple and easy to learn, suitable for all kinds of people. - The number of balls can be loaded: 15 balls for normal use (no table tennis balls). - Angle of drop: . - Serve frequency: the number of serves is about 15 per minute, and the service machine serves once every 4-6 seconds. - : 4 AA (you need to bring your own battery). Specification: - Material: - Size: 24x16x16.3cm/9.45x6.30x6.42 xinch Package Includes: 1 Piece Table Tennis Machine 1 Piece Specification